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## **Instructions**
### **Step 1: Preheat the Oven**
Preheat your oven to **375°F (190°C)**. Lightly grease a **9×13-inch** baking dish with olive oil.
### **Step 2: Brown the Sausage**
In a skillet over medium heat, brown the Italian sausage until fully cooked. If using **sausages in casings**, cook them whole and slice them later. If using **ground sausage**, crumble it as it cooks. Drain any excess fat and set aside.
### **Step 3: Prepare the Vegetables**
In the same skillet, heat **1 tablespoon of olive oil** and sauté the **onions, bell peppers, and garlic** for about **5 minutes**, until slightly softened.
### **Step 4: Assemble the Casserole**
1. Spread the sautéed vegetables in the bottom of the prepared baking dish.
2. Add the **browned sausage** on top.
3. Pour the **diced tomatoes and marinara sauce** evenly over everything.
4. Sprinkle with **Italian seasoning, salt, black pepper, and red pepper flakes**.
5. If using cheese, sprinkle **mozzarella or Parmesan** over the top.
### **Step 5: Bake the Casserole**
Cover with foil and bake for **20 minutes**. Remove the foil and bake for another **10 minutes**, or until the cheese is melted and bubbly (if using).
### **Step 6: Serve & Enjoy!**
Let the casserole rest for **5 minutes**, then garnish with fresh basil or parsley. Serve over pasta, rice, or with crusty Italian bread.
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## **Tips for the Best Sausage and Pepper Casserole**
🔥 **Use different sausages** – Try spicy Italian sausage for heat or sweet sausage for a milder taste.
🔥 **Make it low-carb** – Serve over cauliflower rice or eat it on its own.
🔥 **Meal prep-friendly** – Store leftovers in the fridge for up to **4 days** or freeze for later.
This **Italian Sausage and Pepper Casserole** is a simple yet satisfying meal that’s perfect for busy nights. Try it once, and it’ll become a family favorite! 🍽🇮🇹
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