Stuffed Pepper Casserole

If you love classic stuffed peppers but don’t want to spend time stuffing individual peppers, this Stuffed Pepper Casserole is the perfect shortcut. It combines all the comforting flavors of traditional stuffed peppers in one easy, cheesy baking dish.

Italian sausage, tender bell peppers, onions, tomatoes, and fluffy white rice are tossed with Worcestershire sauce and warm seasonings, then topped with plenty of melted mozzarella. Everything bakes together until hot and bubbly, creating a hearty casserole that’s ideal for busy weeknight dinners.

With just 15 minutes of prep and 30 minutes of cooking time, this easy stuffed pepper casserole is a simple way to get a satisfying family meal on the table.

Why You’ll Love This Recipe

• Easy one-dish dinner: You get all the flavors of stuffed peppers without stuffing individual peppers.
• Perfect for busy nights: With prepared rice and cooked sausage, assembly is quick and simple.
• Cheesy and comforting: Melted mozzarella creates a delicious golden topping.
• Family-friendly: Mild bell peppers, savory sausage, rice, and cheese make a combination that’s easy to love.
• Great for leftovers: The casserole reheats well for easy lunches and dinners.

Ingredients

• Italian sausage: Provides the main savory flavor and hearty protein. Cook and drain it well before adding it to the casserole.
• Olive oil: Used to sauté the vegetables and soften them before baking.
• White onion: Adds savory depth and a touch of natural sweetness.
• Yellow bell pepper: Brings mild sweetness, color, and texture.
• Red bell pepper: Adds another layer of sweetness and vibrant color.
• Green bell pepper: Provides the classic slightly earthy bell pepper flavor associated with stuffed peppers.
• Cooked long-grain white rice: Creates the hearty base of the casserole. Make sure the rice is cooked, drained, and cooled before combining.
• Diced tomatoes: Add moisture, acidity, and tomato flavor to the filling.
• Worcestershire sauce: Adds savory umami depth and helps tie the sausage and vegetables together.
• Salt: Enhances the flavors of the casserole.
• Black pepper: Adds mild heat and seasoning.
• Oregano: Brings a fresh, herbaceous Italian-inspired flavor.
• Garlic powder: Adds convenient savory garlic flavor.
• Mozzarella cheese: Melts over the casserole into a gooey, bubbly topping.

How to Make Stuffed Pepper Casserole

1. Prepare the Oven

Preheat your oven to 350°F.

Lightly grease a 9×13-inch baking dish with cooking spray or a small amount of olive oil and set it aside.

2. Cook the Onion and Peppers

Heat about half of the olive oil in a medium saucepan over medium heat.

Add the chopped onion and cook for approximately 1–2 minutes, stirring occasionally.

Add the chopped yellow, red, and green bell peppers.

Continue cooking for another 2–3 minutes, just until the vegetables begin to soften.

Remove the peppers and onions from the saucepan and set them aside.

3. Prepare the Casserole Mixture

In a large mixing bowl, combine the cooked and drained Italian sausage, sautéed onions and peppers, cooked rice, drained diced tomatoes, Worcestershire sauce, salt, black pepper, oregano, and garlic powder.

Add half of the shredded mozzarella and stir gently until everything is evenly distributed.

4. Assemble the Casserole

Transfer the mixture to the prepared 9×13-inch baking dish.

Spread it evenly across the dish so the casserole cooks consistently.

Sprinkle the remaining mozzarella cheese over the top.

5. Bake

Place the casserole in the preheated oven and bake for approximately 20–25 minutes, or until it is hot throughout and the cheese is melted and bubbly.

If you’d like a more golden cheese topping, you can briefly place the casserole under the broiler at the end. Watch it carefully because mozzarella can brown quickly.

6. Serve

Remove the casserole from the oven and let it sit for a few minutes before serving.

Scoop generous portions onto plates and serve while hot, with the melted mozzarella still gooey and delicious.

Tips for Success

• Drain the sausage well: Place cooked sausage on paper towels before adding it to the casserole. This helps prevent excess grease from making the dish oily.
• Use three bell peppers: Mixing red, yellow, and green peppers creates a great balance of sweetness, color, and flavor.
• Don’t overcook the peppers: They only need a few minutes of sautéing because they’ll continue cooking in the oven.
• Use cooled rice: Cooled, cooked rice is easier to mix and helps prevent the casserole from becoming overly soft.
• Drain the tomatoes: Excess tomato liquid can make the casserole watery.
• Adjust the cheese: The recipe has a moderate amount of cheese, but you can easily double it if you prefer an extra-cheesy casserole.
• Don’t skip the oregano: It adds a fresh, Italian-inspired flavor that works especially well with the sausage and peppers.
• Rest briefly before serving: A few minutes of resting makes the casserole easier to portion.

Equipment Needed

• 9×13-inch baking dish
• Medium saucepan
• Large mixing bowl
• Wooden spoon or spatula
• Cutting board
• Chef’s knife
• Measuring cups and spoons

Recipe Variations

Extra-Cheesy Stuffed Pepper Casserole

For a richer, cheesier casserole, double the mozzarella or add a combination of mozzarella and sharp cheddar.

Turkey Sausage Version

Replace the Italian sausage with Italian turkey sausage for a lighter alternative while keeping the dish flavorful.

Brown Rice Stuffed Pepper Casserole

Swap the white rice for cooked brown rice for a heartier texture and nuttier flavor.

Spicy Stuffed Pepper Casserole

Use hot Italian sausage or add crushed red pepper flakes for a spicy kick.

Add More Vegetables

Stir in chopped zucchini, mushrooms, spinach, or additional tomatoes for an extra vegetable-packed version.

Low-Carb Version

Replace the rice with cauliflower rice. Cook and drain the cauliflower rice well first to prevent excess moisture.

Serving Suggestions

This Stuffed Pepper Casserole is hearty enough to serve as a complete meal, but simple sides can make dinner feel even more special.

Try serving it with:

• Crisp green salad
• Garlic bread
• Roasted broccoli
• Steamed green beans
• Sautéed zucchini
• Crusty Italian bread
• Simple tomato and cucumber salad

A fresh green salad is especially good alongside the casserole because its crisp texture balances the warm, cheesy filling.

Frequently Asked Questions

Can I use different colored bell peppers?

Absolutely. You can use any combination of bell peppers you like. The recipe recommends using three peppers total, but you can choose red, yellow, orange, or green based on your preference.

Can I use freshly cooked rice?

Yes. The important thing is to use cooked rice. Allow it to cool and drain well before adding it to the casserole.

Can I make this casserole ahead of time?

Yes. You can assemble the casserole, cover it, and refrigerate it until you’re ready to bake. If it is chilled before baking, it may require additional oven time to heat completely through.

What type of sausage works best?

Italian sausage works especially well because it provides most of the savory flavor in the dish. Mild Italian sausage is a good family-friendly choice, while hot Italian sausage can be used if you prefer spice.

Can I add more cheese?

Definitely. The recipe uses a moderate amount of mozzarella, so cheese lovers can easily increase the amount or add another cheese such as Parmesan or cheddar.

How do I keep the casserole from becoming greasy?

The most important step is to thoroughly drain the cooked sausage on paper towels before adding it to the casserole. This removes excess rendered fat and keeps the finished dish from becoming overly greasy.

Final Thoughts

This Stuffed Pepper Casserole takes everything you love about classic stuffed peppers and turns it into an easy, comforting weeknight meal. There’s no need to carefully stuff individual peppers—just combine the sausage, vegetables, rice, tomatoes, seasonings, and cheese, then let the oven do the work.

The combination of sweet bell peppers, savory Italian sausage, fluffy rice, tangy tomatoes, oregano, and bubbling mozzarella makes every bite satisfying. It’s simple, family-friendly, and easy to customize, making this a recipe you’ll want to keep handy whenever you’re craving classic stuffed pepper flavor without the extra effort.

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