A whole pepper can look perfectly cooked while the filling still needs attention. This stuffed pepper casserole sidesteps that juggling act: soften chopped peppers in a skillet, fold in cooked rice, then bake everything under a light layer of mozzarella. You get a spoonable beef-and-tomato dinner without hollowing out a single pepper.
Cook the rice first and let the peppers soften before baking. The oven can then concentrate on bringing the casserole together.
Why cooked rice makes this stuffed pepper casserole simpler
I’d choose cooked long-grain rice here because it removes one variable from dinner. Raw rice needs enough liquid, heat, and time to become tender; with cooked rice, you can judge the sauce before the baking dish goes into the oven.
- Measure after cooking. The card calls for 3 cups of cooked rice, not dry rice. That distinction makes a much bigger difference than the shape of your baking dish.
- Keep the grains separate. Break up chilled clumps gently before folding them into the sauce. Vigorous stirring turns soft rice into smaller, starchier fragments.
- Skip the extra broth. This is not an absorption-style rice bake. The tomatoes provide the sauce; a large pour of broth would leave the finished dish loose.
Starting with freshly cooked rice is fine, too. If you are cooking it specifically for dinner, begin that pot first and prepare the vegetables while it simmers; allow its package cooking time in addition to the timing below.
Choose peppers and sauce that keep their character
Red bell peppers bring sweetness and stay easy to spot among the rice and beef. Cut them into roughly ½-inch pieces: large enough to register in a forkful, small enough to soften in the skillet without an extended oven stay.
- Red or mixed peppers: Yellow and orange peppers can replace some of the red by weight. Green peppers give the dish a more assertive, slightly bitter edge.
- Lean beef: Use 93% lean ground beef and break it into small crumbles. Cook it through before adding the sauce; color alone does not establish a safe temperature.
- Tomatoes: Undrained diced tomatoes supply pieces and juice, while tomato paste gives the mixture body. Keep both rather than replacing everything with a thin tomato drink.
- Cheese: A measured cup of shredded mozzarella leaves some peppers visible. I prefer that to a thick blanket that makes every bite taste mostly of cheese.
Brown rice can stand in for white rice when it is already fully cooked. Its firmer chew changes the result, and the nutrition estimate will change; do not substitute dry brown rice and rely on the same baking time.
The skillet checks that prevent a watery bake
The most useful checkpoint comes before the rice goes in. Drag a spatula across the bottom of the skillet: the tomato mixture should briefly leave a trail rather than immediately flood it with watery juice.
- Peppers still hard? Give them more skillet time before adding rice. The final bake is relatively short and should not carry the entire vegetable-cooking job.
- Sauce looks soupy? Simmer uncovered, stirring, until it thickens. Covering the skillet traps the steam you are trying to release.
- Mixture looks dry? Add water a tablespoon at a time, just enough to loosen it. Aim for rice coated in sauce, not rice sitting in a pool.
- Cheese browns early? Loosely cover the dish with foil and continue until the center reaches 165°F (74°C). A golden top cannot tell you the middle is ready.
A short rest after baking makes scooping easier, although this remains a casserole rather than neat, sliceable squares. Dinner does not need straight edges to be doing its job.
Serve tonight and save the rest safely
A crisp green salad is enough alongside this combination of rice, vegetables, and beef. For a smaller appetite, start with a modest scoop and let everyone decide whether they want more; the six-serving yield is a portioning guide.
- Refrigerate promptly: Divide leftovers into shallow containers and refrigerate within 2 hours, or within 1 hour when the surrounding temperature exceeds 90°F (32°C). Keep the refrigerator at 40°F (4°C) or colder.
- Use within 3–4 days: If the rice or beef was already leftover, count from when that ingredient was first cooked. Baking does not restart its storage clock.
- Reheat only what you need: Cover the portion, add a small splash of water if needed, and heat to 165°F (74°C) throughout. Stir microwaved portions and check more than one spot.
Recipe
Use a 9-by-13-inch baking dish and a wide skillet so the vegetable mixture has room to release moisture. The recipe below starts with cooked rice; if you need to make rice first, follow its package directions and include that extra time in your dinner plan.
Stuffed Pepper Casserole Recipe
Ingredients
- 1 tablespoon olive oil 13.5 g
- 1 pound 93% lean ground beef 454 g, raw
- 3 medium red bell peppers 450 g after trimming, cut into ½-inch pieces
- 1 medium yellow onion 150 g, diced
- 3 cloves garlic 9 g, minced
- 2 tablespoons tomato paste 32 g
- 1 teaspoon dried oregano 1 g
- 1/2 teaspoon fine salt 3 g
- 1/4 teaspoon black pepper 0.6 g
- 1 28-ounce can no-salt-added diced tomatoes 794 g, undrained
- 3 cups cooked long-grain white rice 474 g, cooked without salt
- 1 cup shredded low-moisture part-skim mozzarella 112 g
Equipment
- 1 9-by-13-inch baking dish
- 1 Large skillet
- 1 Spatula
- 1 Instant-read thermometer
Instructions
- Heat the oven to 375°F (190°C). Set out a 9-by-13-inch baking dish. Break up any clumps in the cooked rice.
- Warm the oil in a wide skillet over medium-high heat. Add the beef and cook, breaking into crumbles, for about 5–7 minutes, until it reaches 160°F (71°C). Transfer to a bowl with a slotted spoon. Leave the cooking fat in the skillet; nutrition calculation assumes it is retained.
- Add the peppers and onion to the skillet. Cook over medium heat for 8–10 minutes, stirring, until the peppers are almost tender. Stir in garlic, tomato paste, oregano, salt, and pepper; cook 1 minute.
- Add the undrained tomatoes and return the beef. Simmer uncovered for 5–7 minutes, stirring, until the sauce is thick and a spatula briefly leaves a trail. If too dry, add water 1 tablespoon at a time.
- Gently fold in the cooked rice and heat until steaming. Transfer to the baking dish and distribute evenly. Sprinkle with mozzarella.
- Bake uncovered for about 15–20 minutes, until bubbling and the center reaches 165°F (74°C). Loosely tent with foil if the cheese browns before the middle is hot. Rest 5 minutes and divide into six equal portions.
Nutrition
Video
Video: Mike Hultquist of Chili Pepper Madness demonstrates stuffed pepper casserole with ground beef, cooked rice and a baked cheese topping. His version uses fire-roasted tomatoes, Worcestershire sauce and different seasonings and cheese. Follow the ingredients, quantities and oven instructions above for this version.
Notes
Tried this recipe?
Let us know how it turned out!Sources
- USDA FSIS: leftover cooling, storage, and reheating guidance.
- FoodSafety.gov: safe minimum internal temperatures.
Hi, I’m Laura, the voice behind Tastiva. I’ve always believed that eating well should feel enjoyable, comforting, and realistic—not like another complicated rule to follow. I love creating recipes that fit into everyday life, sharing simple nutrition ideas, and finding small ways to make meals feel a little better without losing the pleasure of good food.