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This baked beef chili relleno casserole brings together the bold flavors of Mexican comfort food in one showstopping dish. Stuffed poblano peppers, tender beef, and melted cheese create a hearty centerpiece that feeds a crowd without the fuss of individual baking. The secret lies in layering flavors—smoky chili, creamy cheese, and savory beef—all baked to golden perfection in one dish.
Traditional chili relleno gets an upgrade here with a casserole approach that’s perfect for gatherings. You’ll start with roasted poblano peppers, stuffed with a rich beef and chili mixture, then topped with cheese for that signature melt. The dish bakes until bubbly and aromatic, delivering restaurant-quality results with minimal effort. No need for individual baking—just one pan, one oven, and one incredible meal.
What makes this recipe shine is its balance of texture and flavor: tender beef, slightly charred peppers, and a blanket of melted cheese that ties everything together. Serve with warm tortillas or crusty bread to soak up every last bit of the savory sauce. This is the kind of dish that transforms a weeknight into a celebration.
The best part? It scales effortlessly—double or triple the recipe for parties, and leftovers reheat beautifully. Whether you’re hosting a dinner or feeding a family, this casserole delivers warmth, heartiness, and a taste of tradition in every bite. Ready to make it?
Ingredients for baked beef chili relleno casserole
Six peppers, tender beef, and bold spices—this casserole brings Mexican comfort food to your table with minimal fuss.
| Ingredient | Amount | Notes |
|---|---|---|
| Poblano Peppers 🌶️ | 6 whole | Medium-sized, charred and peeled |
| Ground Beef 🥩 | 2 lb | 80/20 fat ratio preferred |
| Onion 🧅 | 1 whole | Yellow or white, diced |
| Garlic Cloves 🧄 | 6 cloves | Freshly minced |
| Canned Tomato Sauce 🍅 | 1 can | 28 oz, San Marzano preferred |
| Chili Powder 🌶️ | 2 tbsp | Mexican blend for authentic flavor |
| Ground Cumin 🌿 | 1 tbsp | Toasted for deeper aroma |
| Dried Oregano 🍃 | 1 tsp | Mexican oregano if available |
| Salt 🧂 | 1 ½ tsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | ½ tsp | Freshly ground |
| Shredded Monterey Jack Cheese 🧀 | 2 cups | Freshly shredded, full-fat |
| Shredded Cheddar Cheese 🧀 | 1 cup | Sharp variety for extra flavor |
| Sour Cream 🥛 | ½ cup | Full-fat for creaminess |
| Olive Oil 🫒 | 2 tbsp | For roasting peppers |
| Fresh Cilantro 🌿 | ¼ cup | Chopped, for garnish |
The poblano peppers are the star—roast them until charred for that smoky depth. Grab them at Trader Joe's or Latin markets where they're often fresher than the big-box stores. Medium-sized peppers (about 3-4 inches long) work best—they hold the filling without bursting. If you can't find poblanos, jalapeños or bell peppers in a pinch (though flavor will differ). Char them directly over a gas flame or under a broiler, turning often until blackened all over. The skin will peel right off once you wrap them in a towel for 10 minutes—worth the extra minute for that authentic taste.
The beef is where the richness comes in—80/20 fat ratio keeps it juicy, but don't skip the browned crust. Costco or local butchers often have better quality than pre-packaged ground beef. For the spices, Penzeys or bulk bins are your friends if you want to splurge, but the grocery store stuff works fine. No chili powder? Mix 1 tbsp smoked paprika + 1 tsp cayenne. The tomato sauce can be store-bought (I like Rao's or Muir Glen) or homemade—just make sure it's smooth, not chunky. And that sour cream topping? Full-fat only—it makes all the difference in creaminess. If you're watching calories, use Greek yogurt instead, but trust me on the full-fat version.
This casserole reheats like a dream—even better the next day once all the flavors meld. Store leftovers covered in the fridge for 4-5 days or freeze portions for up to 3 months. I like to portion mine into individual servings before freezing so I can just pop one out for a quick meal. The cheese gets a little crispy on top when reheated—cover with foil for the first 5 minutes if you prefer it softer. And if you're making this ahead? Assemble it the night before and refrigerate—it'll be even more flavorful when you bake it.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this recipe—no chopping boards, no extra pots, just one sheet pan. The poblanos roast right alongside the beef, so you’re not stuck peeling or dicing while dinner burns.
- Smoky Depth Bomb: That charred poblano filling? It’s where the magic happens. The roasted peppers add this smoky, slightly sweet contrast to the rich tomato sauce and ground beef—like a hug in a casserole dish.
- Meal Prep Hero: Between us, this is my go-to for busy nights. Make it Sunday, reheat it Wednesday, and no one will question why it’s back on the table. The flavors actually improve after sitting overnight.
- Budget-Friendly Powerhouse: Ground beef, canned tomatoes, and poblanos? Check. No fancy ingredients, just big flavor. I’ve fed six people for under $15—and still had leftovers for lunch the next day. (Yes, even on a Tuesday night.)
Step-by-step instructions for baked beef chili relleno casserole
This cheesy stuffed pepper casserole comes together in layers of smoky, spicy goodness.
Char and Prepare the Poblano Peppers
Preheat your oven's broiler to high. Place the 6 whole poblano peppers directly on the oven rack and broil for 8-10 minutes, turning occasionally, until the skins are completely blackened and blistered all over. This charring step is crucial—it deepens the smoky flavor and makes peeling easier.
Once charred, transfer the peppers to a bowl and cover tightly with plastic wrap. Let them steam for 10 minutes—this helps the skins slide right off. Peel away the charred skin, then make a small slit in the bottom of each pepper and carefully remove the seeds and membranes using a small spoon. Set the cleaned peppers aside until ready to stuff.
Cook the Chili Beef Filling
Heat the 2 tablespoons olive oil in a large skillet over medium-high heat. Add the diced onion and cook for 5-6 minutes until softened and translucent. Add the 2 pounds ground beef and cook, breaking it apart with a wooden spoon, until no longer pink and the meat is well browned—about 8-10 minutes. Drain excess fat if needed.
Add the 6 cloves minced garlic, 2 tablespoons chili powder, 1 tablespoon ground cumin, 1 teaspoon dried oregano, 1.5 teaspoons salt, and 0.5 teaspoon black pepper. Stir well to coat the beef and cook for 1 minute until fragrant. Pour in the 1 can tomato sauce and stir to combine. Let the mixture simmer for 5 minutes to meld the flavors. Remove from heat and let cool slightly.
Assemble the Stuffed Peppers
Preheat your oven to 375°F. Working quickly, divide the warm beef mixture evenly among the 6 poblano peppers, stuffing each one generously. Place the stuffed peppers upright in a 9x13-inch baking dish, standing them close together but not touching. This ensures they hold their shape during baking.
In a small bowl, stir together the 2 cups shredded Monterey Jack cheese and 1 cup shredded cheddar cheese. Sprinkle half of this cheese mixture evenly over the stuffed peppers, pressing down gently to help it adhere. Pour 0.5 cup sour cream evenly over the top, then sprinkle the remaining cheese mixture on top. The cheese will melt into a bubbly, golden blanket.
Bake to Melty Perfection
Bake uncovered for 30-35 minutes until the cheese is bubbly and golden brown and the peppers are tender when pierced with a fork. The filling should be heated through, and the cheese should have developed a crispy top layer. If the cheese browns too quickly, tent loosely with aluminum foil for the last 10 minutes of baking.
Remove from the oven and let rest for 5 minutes before serving. This resting time allows the filling to set slightly, making it easier to handle. Garnish each serving with 0.25 cup chopped fresh cilantro just before serving for a bright, fresh finish. Serve with warm tortillas or crusty bread to soak up every last bit of that cheesy, smoky goodness.
Pro Tips For Making Baked Beef Chili Relleno Casserole
- CHAR THE POBLANOS FIRST: Roast whole poblano peppers over an open flame or under a broiler for 8-10 minutes until blackened—this deepens their smoky flavor way more than just charring them in a pan. After removing the skins, slice them thick (about ¼-inch) so they hold up when baked in the casserole. I used to just blister them in a skillet, but the oven method gives that restaurant-quality smokiness without the mess.
- BROWN THE BEEF WELL: Don’t skip the sear—break the ground beef into small, even crumbles and cook it in batches over medium-high heat until it’s deeply browned, not just pink. That crust adds flavor that canned tomato sauce alone can’t match. I learned this the hard way when my first batch tasted bland; now I take the extra 5 minutes and never look back.
- SAVE THE PEPPER JUICES: When you remove the poblano skins, don’t pour out that dark, smoky liquid—strain it and add it back to the casserole mixture. It’s packed with flavor that’ll make your dish richer without extra effort. I used to waste it, but now I keep a small bowl handy just for this purpose.
- BAKE UNTIL THE TOP CRUSTS: Cover the casserole with foil for the first 45 minutes to avoid a dry top, then uncover and bake another 10-15 minutes until the cheese is golden and bubbly. The last few minutes uncovered guarantee that perfect textured crust that holds everything together. I know it’s tempting to peek early, but resist—your future self will thank you.
Dietary considerations for this dish
Gluten-Free Adaptations
This casserole is naturally gluten-free if you use certified gluten-free ingredients. The poblano peppers, beef, and spices are all gluten-free staples, but always check labels on canned tomato sauce and cheese blends for hidden gluten. I recommend Rao's Unsalted Tomato Sauce or Muir Glen Organic—both are gluten-free and add great depth. For extra insurance, use tamale-style corn tortillas on the side instead of flour tortillas. 🌶️
Dairy-Free Swaps
Skip the cheese blanket and use dairy-free shredded cheddar like Violife or Daiya for a melty texture. Replace sour cream with cashew cream (blend 1 cup soaked cashews with ¼ cup water) or coconut yogurt. For richness, stir 1 tablespoon nutritional yeast into the beef mixture—it adds a cheesy, umami kick. The peppers will still hold their shape without dairy.
Lower-Carb Options
Cut carbs by halving the cheese to 1 cup total and using cauliflower rice mixed into the beef filling. Replace poblano peppers with zucchini boats (halve and scoop out seeds) or portobello mushrooms for a heartier base. I like Trader Joe's frozen cauliflower rice—it cooks fast and blends well. For extra flavor, add ¼ cup diced jalapeños to the filling.
Vegetarian Version
Swap the beef for crumbled tempeh or lentils (cook 1.5 cups dry lentils until tender). Boost umami with 1 tablespoon soy sauce or miso paste in the filling. For meaty texture, try Beyond Meat crumbles—they brown beautifully. Keep the poblano peppers and cheese for that classic chili relleno vibe, just without the beef. 🌱
Allergen Awareness
Watch for cross-contamination if sharing a kitchen with allergies. Use separate utensils for cheese prep if someone has a dairy allergy. For nut allergies, avoid cashew cream and opt for coconut yogurt instead. If making ahead, store components separately—keep the cheese and sour cream separate until baking to prevent texture issues. Always double-check labels on spices and sauces for potential allergens like soy or sesame.
Nutrition facts
Frequently asked questions
Can I use bell peppers instead of poblanos?
Yes, but expect a milder flavor! Bell peppers work in a pinch, but they lack the smoky depth of charred poblanos. If using them, roast until very tender (they won't char as easily) and add ½ teaspoon smoked paprika to the filling to compensate. For authenticity, poblanos are ideal—their slightly bitter, earthy taste balances the richness of the beef perfectly.
How do I prevent the stuffed peppers from falling apart?
Use medium-sized poblanos (3-4 inches long) and stuff them generously but not overfilled. Place them upright in the baking dish, close together but not touching. For extra stability, sprinkle a thin layer of cooked rice or cauliflower rice at the bottom of the dish before adding the peppers. Chill the assembled casserole for 15 minutes before baking to help the filling set.
Can I make this ahead of time?
Assemble the casserole (stuffed peppers + cheese topping) and refrigerate uncovered for up to 24 hours before baking. This enhances flavors dramatically. For freezing, bake the casserole first, then cool completely, wrap tightly, and freeze for up to 3 months. Reheat in a 350°F oven for 20-25 minutes with foil, then broil for 2-3 minutes to crisp the cheese.
What's the best way to reheat leftovers?
Leftovers reheat beautifully! Cover with foil and warm in a 350°F oven for 15-20 minutes until heated through. For a crispy top, broil for 2 minutes at the end. Microwave reheating works too: Place in a microwave-safe dish with 2 tablespoons water, cover, and heat on 50% power for 2-3 minutes, stirring halfway.
Can I add beans or rice to the filling?
Yes! For extra heartiness, stir in 1 cup cooked black beans or ½ cup cooked rice with the beef. Drain and rinse canned beans first to remove excess sodium. If adding rice, use ½ cup uncooked (about 1 cup cooked) and cook it separately before mixing. This boosts texture and makes the dish even more filling—perfect for large gatherings!