This easy dump-and-bake vegetarian stuffed pepper casserole captures all the flavor of classic stuffed peppers with far less work. No parboiling, no stuffing individual peppers, and no pre-cooked rice—everything goes into one dish raw, and the oven finishes it for you.
Stuffed peppers are a favorite, but preparing them the traditional way can be time consuming. This casserole streamlines the process: chopped bell peppers, black beans, uncooked rice, and a seasoned tomato-broth mixture are combined in a single baking dish, covered, and baked. After the rice absorbs the flavorful liquid, the casserole is finished with a quick sprinkling of cheese and a short additional bake until bubbly. The result tastes like stuffed peppers but comes together with minimal hands-on time.
Why You’ll Love This Casserole
The rice cooks right in the dish, saving time and reducing cleanup. Because the uncooked rice bakes in the flavorful broth and tomato juices, each grain absorbs more taste than if you stirred cooked rice in at the end. This recipe is essentially hands-off after a quick prep: chop the vegetables, stir everything together, cover, and let the oven do the work. A 9×13-inch pan yields a generous amount suitable for dinner and leftovers, and the casserole reheats well for lunches or quick weeknight meals.
It’s also flexible: swap beans, change the cheese, or adapt the seasonings to suit your pantry or preferences. The method is forgiving, making this an excellent option for beginner cooks or busy weeknights.
Ingredients and Substitutions
- Rice: Use long-grain white rice and do not rinse it—the surface starch helps the finished casserole bind together. Avoid brown rice here; it requires more liquid and a longer cook time.
- Bell peppers: Three peppers chopped into roughly 3/4-inch pieces. Include at least one red or orange pepper for a sweeter note to balance the tomatoes.
- Onion: One small yellow onion, diced. Red or white onion works fine if that’s what you have.
- Black beans: A can of black beans adds protein and fiber. Pinto beans or cooked lentils are suitable alternatives—just be sure to drain and rinse canned beans.
- Fire-roasted tomatoes: Use undrained diced tomatoes so their juices contribute to the cooking liquid. Fire-roasted adds a subtle smokiness, but regular diced tomatoes are acceptable.
- Tomato sauce and vegetable broth: These two components provide the liquid that cooks the rice, so measure for the best results.
- Seasonings: Italian seasoning, smoked paprika, garlic (fresh or powder), salt, and black pepper. For a Southwestern twist, you can substitute a taco seasoning blend.
- Mozzarella: Shredded mozzarella melts nicely; mix with cheddar if you prefer a sharper, more pronounced cheese flavor.
How to Make a Dump-and-Bake Casserole
Tips & Tricks
A few simple steps make a big difference in the final texture and flavor:
- Ensure the rice is fully submerged after stirring everything together. Any grains above the liquid will remain undercooked and crunchy.
- Cover the dish tightly with foil so steam is trapped; the steam is what cooks the rice evenly.
- If the rice still has a bite at 45 minutes, re-cover and bake for an additional 10 minutes. Oven temperatures vary, and the tight foil seal matters.
Meal Prep and Storage
Store leftovers in an airtight container in the refrigerator for up to four days. Reheat single servings in the microwave with a splash of broth or water to loosen the mixture before heating, or reheat in a 350°F oven until warmed through.
What to Serve With It
This casserole is a satisfying main dish on its own. Serve with crunchy accompaniments such as tortilla chips or pita chips, or pair it with a simple green salad or crusty garlic bread. A dollop of sour cream or plain Greek yogurt on top adds cool creaminess and balances the tomato flavors.
More Easy Dinner Ideas
If you enjoy this dump-and-bake approach, try other one-dish meals like a quinoa-based casserole, a rice-and-beans bake, or a white bean and pesto casserole. These recipes follow a similar easy method and are designed for minimal prep and maximum flavor.
Vegetarian Stuffed Pepper Casserole (Dump & Bake)
- Author: Liz Thomson
- Prep Time: 10 minutes
- Cook Time: 55 minutes
- Total Time: 1 hour 5 minutes
- Yield: 8 cups
- Category: Dinner
- Method: Oven
- Cuisine: American
- Diet: Vegetarian
Ingredients
- 1 cup uncooked long-grain white rice (do not rinse)
- 3 bell peppers, chopped into 3/4-inch pieces (about 3 cups), mix of colors preferred
- 1 small yellow onion, diced
- 1 (15 oz) can black beans, drained and rinsed
- 1 (14.5 oz) can fire-roasted diced tomatoes, undrained
- 1 (8 oz) can tomato sauce
- 2 cups vegetable broth
- 2 cloves garlic, minced (or 1/2 teaspoon garlic powder)
- 1 1/2 teaspoons Italian seasoning
- 1 teaspoon smoked paprika
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 1/2 cups shredded mozzarella (or mozzarella-cheddar mix)
- Optional for serving: tortilla chips or pita chips
Instructions
- Preheat the oven to 400°F. Lightly spray a 9×13-inch baking dish with nonstick spray.
- Add rice, chopped peppers, diced onion, drained beans, undrained diced tomatoes, tomato sauce, vegetable broth, garlic, and all seasonings to the dish. Stir to combine, then spread the mixture so the rice is completely submerged in the liquid.
- Tightly cover the dish with foil and bake for 45 minutes.
- Remove the foil and check a spoonful of rice from the center. If the rice is still firm, re-cover and bake for 10 more minutes. If the mixture looks soupy, don’t worry—it will thicken as it rests.
- Uncover, sprinkle the shredded cheese evenly over the top, and bake uncovered for about 10 minutes or until the cheese melts and edges are bubbly.
- Let the casserole rest a few minutes, then serve hot with chips or a simple salad.
