Sausage and Pepper Polenta Casserole
Sausage and Pepper Polenta Casserole turns simple prepared polenta, Italian sausage, sweet bell peppers, marinara, and melted cheese into a hearty weeknight dinner that tastes like it simmered all afternoon.
This recipe is rich, cozy, and easy to build from scratch with everyday ingredients. The polenta gets tender and creamy in the sauce, the sausage brings deep savory flavor, and the cheese bakes into a golden bubbling top.
Why You’ll Love This Recipe
- Big comfort with little prep: Prepared polenta saves time while still giving the casserole a soft, satisfying base.
- Deep flavor fast: Browning sausage with peppers, onion, and garlic builds a rich sauce in minutes.
- Great texture: You get tender polenta, juicy sausage, sweet peppers, and stretchy mozzarella in every scoop.
- Budget-friendly: A small list of common ingredients makes a filling meal for 4 people.
Fabian’s Budget and Health Tip: Use one pound of Italian sausage and stretch it with extra bell peppers, onion, and polenta. You still get bold flavor, but the casserole costs less per serving. For a lighter option, choose chicken Italian sausage and part skim mozzarella.
Ingredients (Serves 4)
- 1 pound Italian sausage, mild or hot, casings removed if needed (450 g)
- 1 tablespoon olive oil, only if your sausage is very lean (15 ml)
- 2 bell peppers, thinly sliced, any color (300 g)
- 1 medium yellow onion, thinly sliced (150 g)
- 4 garlic cloves, minced (12 g)
- 1 tube prepared polenta, sliced into 1/2 inch rounds (510 g)
- 2 cups marinara sauce (480 ml)
- 1 1/2 cups shredded mozzarella cheese (170 g)
- 1/4 cup grated parmesan cheese (25 g)
- 1/4 cup fresh basil leaves, torn (10 g)
- 1/2 teaspoon kosher salt, or to taste (3 g)
- 1/4 teaspoon black pepper (1 g)
Step-by-Step Instructions
1. Heat the Oven
Preheat the oven to 400 degrees F (200 degrees C). Lightly grease a 9 by 13 inch baking dish or a similar casserole dish.
2. Brown the Sausage
Place a large skillet over medium-high heat. Add the sausage and break it into small crumbles with a spoon. Cook for 5 to 7 minutes, until the edges look browned and the sausage smells savory and lightly toasted. If the pan looks dry, add the olive oil.
3. Soften the Peppers and Onion
Add the sliced bell peppers and onion to the skillet. Stir often for 6 to 8 minutes, until the peppers turn glossy and the onion softens. You want a few golden spots on the vegetables because those browned bits add flavor to the casserole.
4. Add the Garlic
Stir in the minced garlic, salt, and black pepper. Cook for 30 to 60 seconds, just until your kitchen smells like garlic. Do not let the garlic get dark, because it can turn bitter.
5. Build the First Layer
Spoon about 1/2 cup of marinara sauce into the bottom of the baking dish. Arrange half of the sliced polenta over the sauce. The slices can overlap a little.
6. Add Sausage, Sauce, and Cheese
Spoon half of the sausage, pepper, and onion mixture over the polenta. Add 3/4 cup marinara sauce, then sprinkle with about half of the mozzarella. Repeat with the remaining polenta, sausage mixture, and marinara.
7. Top and Bake
Sprinkle the remaining mozzarella and the parmesan over the top. Bake uncovered for 20 to 25 minutes, until the sauce bubbles around the edges and the cheese melts into golden spots.
8. Rest and Add Basil
Let the casserole rest for 5 to 10 minutes before serving. This helps the layers settle so each scoop holds together. Finish with torn fresh basil right before serving for a bright, fresh flavor.
Expert Troubleshooting and FAQs
Can I use homemade polenta instead of prepared polenta?
Yes. Cook thick polenta until it holds its shape, then spread it in a lightly greased pan and chill it until firm. Slice it once cold and use it the same way as prepared polenta.
Why is my casserole watery?
The peppers and onion may need more time in the skillet. Cook them until most of their moisture evaporates and the edges start to brown. Also use a thick marinara sauce rather than a very loose one.
Can I make this casserole ahead of time?
Yes. Assemble the casserole up to 24 hours ahead, cover it, and refrigerate it. Bake it straight from the fridge, adding 10 to 15 minutes if needed. It is ready when the center is hot and the cheese is bubbling.
What kind of sausage works best?
Mild Italian sausage gives a classic family-friendly flavor. Hot Italian sausage adds heat and works well with sweet peppers. Chicken or turkey Italian sausage also works if you want a leaner dish.
How do I keep the polenta from getting mushy?
Slice the polenta into thick rounds and avoid overloading the casserole with sauce. Letting the baked casserole rest before serving also helps the polenta firm up slightly.
Estimated Nutritional Facts
Per serving, rough estimate:
- Calories: 520
- Protein: 25 g
- Carbs: 38 g
- Fats: 31 g
Sausage and Pepper Polenta Casserole
Ingredients
- 1 pound Italian sausage, mild or hot, casings removed if needed (450 g)
- 1 tablespoon olive oil, only if your sausage is very lean (15 ml)
- 2 bell peppers, thinly sliced, any color (300 g)
- 1 medium yellow onion, thinly sliced (150 g)
- 4 garlic cloves, minced (12 g)
- 1 tube prepared polenta, sliced into 1/2 inch rounds (510 g)
- 2 cups marinara sauce (480 ml)
- 1 1/2 cups shredded mozzarella cheese (170 g)
- 1/4 cup grated parmesan cheese (25 g)
- 1/4 cup fresh basil leaves, torn (10 g)
- 1/2 teaspoon kosher salt, or to taste (3 g)
- 1/4 teaspoon black pepper (1 g)
Instructions
- 1. Heat the Oven. Preheat the oven to 400 degrees F (200 degrees C). Lightly grease a 9 by 13 inch baking dish or a similar casserole dish.
- 2. Brown the Sausage. Place a large skillet over medium-high heat. Add the sausage and break it into small crumbles with a spoon. Cook for 5 to 7 minutes, until the edges look browned and the sausage smells savory and lightly toasted. If the pan looks dry, add the olive oil.
- 3. Soften the Peppers and Onion. Add the sliced bell peppers and onion to the skillet. Stir often for 6 to 8 minutes, until the peppers turn glossy and the onion softens. You want a few golden spots on the vegetables because those browned bits add flavor to the casserole.
- 4. Add the Garlic. Stir in the minced garlic, salt, and black pepper. Cook for 30 to 60 seconds, just until your kitchen smells like garlic. Do not let the garlic get dark, because it can turn bitter.
- 5. Build the First Layer. Spoon about 1/2 cup of marinara sauce into the bottom of the baking dish. Arrange half of the sliced polenta over the sauce. The slices can overlap a little.
- 6. Add Sausage, Sauce, and Cheese. Spoon half of the sausage, pepper, and onion mixture over the polenta. Add 3/4 cup marinara sauce, then sprinkle with about half of the mozzarella. Repeat with the remaining polenta, sausage mixture, and marinara.
- 7. Top and Bake. Sprinkle the remaining mozzarella and the parmesan over the top. Bake uncovered for 20 to 25 minutes, until the sauce bubbles around the edges and the cheese melts into golden spots.
- 8. Rest and Add Basil. Let the casserole rest for 5 to 10 minutes before serving. This helps the layers settle so each scoop holds together. Finish with torn fresh basil right before serving for a bright, fresh flavor.
