Step 1: Preheat the Oven

• Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with olive oil or cooking spray.

Step 2: Cook the Sausage

• Heat a large skillet over medium heat. Add 1 tablespoon of olive oil. Once hot, add the diced onions and sauté for 2-3 minutes until softened.
• Add the minced garlic and cook for an additional minute until fragrant.
• Add the spicy Italian sausage to the skillet, breaking it apart with a spoon. Cook for 6-8 minutes until the sausage is browned and cooked through.

Step 3: Add the Vegetables and Pepperoni

• Stir in the diced red and green bell peppers, cooking for about 5 minutes until they begin to soften.
• Add the sliced pepperoni and continue to cook for another 2 minutes, allowing the flavors to meld together.

Step 4: Mix in the Tomatoes and Seasonings

• Stir in the diced tomatoes and tomato paste, mixing well.
• Add the dried oregano, basil, crushed red pepper flakes, salt, and black pepper. Let the mixture simmer for 5-7 minutes until it thickens slightly.

Step 5: Combine with Rice

• In a large bowl, mix the cooked rice with the sausage and pepperoni mixture until well combined. Taste and adjust seasoning if needed.

Step 6: Assemble the Rice Bake

• Transfer the rice mixture into the prepared baking dish, spreading it out evenly.
• Top the rice with an even layer of shredded mozzarella cheese, followed by a sprinkle of grated Parmesan cheese.

Step 7: Bake

• Place the baking dish in the preheated oven and bake for 20-25 minutes until the cheese is melted and bubbly, and the top is golden brown.

Step 8: Garnish and Serve

• Remove the dish from the oven and let it cool for 5-10 minutes.
• Garnish with freshly chopped parsley before serving.