This italian sausage and pepper casserole brings browned sausage, colorful bell peppers, and melted mozzarella together in one baking dish that feeds the whole table.
The sausage and vegetables cook in one skillet before everything moves to a casserole dish for a short bake. It works for a weeknight dinner and holds up well as leftovers for lunch the next day.
Table of Contents
Why This Italian Sausage and Pepper Casserole Recipe Works
Browning the sausage first renders fat and builds a savory base, so the peppers and onion cook in flavor instead of plain oil.
Three colors of bell pepper add sweetness and a bright look, and the canned tomatoes bind everything into a light sauce.
A final bake under mozzarella melts the cheese into a golden, bubbly layer and ties the sausage and vegetables together.
Ingredients for Italian Sausage and Pepper Casserole
- For the skillet: one pound Italian sausage, one medium onion, diced, two cloves garlic, minced, and one red, one green, and one yellow bell pepper, sliced.
- For the bake: one can diced tomatoes, one cup shredded mozzarella cheese, and a little black pepper.
Italian sausage. Mild or hot sausage works here, and removing the casings lets it break into crumbles that brown evenly.
Bell peppers. Red, green, and yellow peppers cook down at different rates, so slice them to the same thickness.
Onion and garlic. Diced onion softens into the base, and garlic goes in alongside it so it cooks briefly and does not turn bitter.
Canned tomatoes. Diced tomatoes add moisture and acidity that balance the rich sausage and keep the casserole from drying in the oven.
Mozzarella. Shredded mozzarella melts smoothly and browns lightly, and grating a block yourself gives a smoother melt than bagged shreds.
How to Make Italian Sausage and Pepper Casserole
1. Heat the oven Heat the oven to 375 degrees F and lightly grease a casserole dish so it is ready when the skillet is finished.
2. Brown the sausage Cook the sausage in a large skillet over medium heat until browned and cooked through, then lift it out and drain the excess fat.
3. Soften the onion In the same skillet, cook the onion and garlic until the onion turns translucent, stirring often so the garlic does not scorch.
4. Cook the peppers Add the sliced bell peppers and cook until tender, scraping up the browned bits from the bottom of the pan as you stir.
5. Combine Return the sausage to the skillet, stir in the diced tomatoes, and season with black pepper until the mixture is evenly coated.
6. Top with cheese Pour the mixture into the casserole dish, spread it level, and sprinkle the mozzarella over the surface.
7. Bake Bake for 20 to 25 minutes, until the cheese is melted and bubbly, then rest for a few minutes before serving hot.
How to Serve Italian Sausage and Pepper Casserole
Serve the casserole hot with an Italian house salad and a basket of mozzarella cheesy garlic bread to catch the juices. Roasted air fryer asparagus adds a green side, and creamy garlic Parmesan orzo turns it into a bigger meal.
How to Store and Reheat Italian Sausage and Pepper Casserole
Cool the casserole within 2 hours, cover it, and refrigerate for 3 to 4 days. Reheat portions in the oven or microwave until they reach 165 degrees F in the center. For longer storage, freeze it in a sealed container for up to 2 months and thaw it in the refrigerator overnight before reheating.
Tips and Variations for Italian Sausage and Pepper Casserole
Cook the sausage thoroughly. Pork sausage should reach 160 degrees F, and the bake finishes the job, but check the center of a few pieces.
Drain the fat. Remove excess fat before the vegetables go in so the casserole stays rich without turning greasy.
Add pasta. Cooked pasta stirred in before baking stretches the casserole to feed more people and soaks up the tomato juices.
Add heat. Red pepper flakes or hot sausage bring a gentle kick without changing the cooking time.
Flag the allergens. The mozzarella brings milk, and some sausage contains wheat or soy fillers, so read the label before serving guests.
Slice evenly. Keep the pepper strips about the same width so they soften at the same pace in the skillet.
Rest before serving. A few minutes of rest lets the cheese set so the portions hold together when spooned out.
Check trusted guidance. Pork sausage needs a safe internal temperature, and the Purdue Extension guide to storing leftovers covers cooling and reheating.
Frequently Asked Questions About Italian Sausage and Pepper Casserole
Can I make this italian sausage and pepper casserole ahead?
Yes. Assemble it in the dish, cover it, and refrigerate for up to a day, then add a few extra minutes to the bake time.
Can I freeze this italian sausage and pepper casserole?
Yes, before or after baking. Freeze it in a sealed container for up to 2 months and thaw it overnight in the refrigerator before heating.
What sausage works in this italian sausage and pepper casserole?
Sweet, mild, or hot Italian sausage all work, and chicken or turkey sausage is a lighter option that cooks to 165 degrees F.
Can I use frozen peppers?
Frozen sliced peppers work, but add them straight from the freezer to the skillet and cook until the extra moisture evaporates.
What can I serve with the leftovers?
Spoon them over rice or pasta, or tuck them into a toasted roll with extra mozzarella for a hot sandwich.
Italian Sausage and Pepper Casserole
Equipment
- Large skillet
- 9 by 13 casserole dish
- Cutting board
Ingredients
Main Ingredients
- 1 lb Italian sausage casings removed if desired
- 1 medium onion diced
- 1 red bell pepper sliced
- 1 green bell pepper sliced
- 1 yellow bell pepper sliced
- 2 cloves garlic minced
- 1 can diced tomatoes about 14 oz, with the juices
- 1 cup shredded mozzarella cheese
- ¼ tsp black pepper
Instructions
Cooking
- Heat the oven. Heat the oven to 375 degrees F and grease a casserole dish.
- Brown. Cook the sausage in a skillet over medium heat until browned, then drain the fat and set the sausage aside.
- Saute. Cook the onion and garlic in the same skillet until the onion is translucent, then add the peppers and cook until tender.
- Combine. Stir the sausage and tomatoes into the skillet and season with the pepper.
- Bake. Transfer to the dish, top with mozzarella, and bake 20 to 25 minutes until bubbly.
