#### **Step 1: Preheat & Prepare**
Preheat oven to **375°F (190°C)** and grease a **9x13-inch baking dish**.
#### **Step 2: Cook the Sausage**
In a skillet, cook **breakfast sausage** over **medium heat** until browned.
Drain excess grease and set aside.
#### **Step 3: Mix the Batter**
In a **large mixing bowl**, whisk together **eggs, milk, Bisquick mix, salt, pepper, onion powder, and garlic powder** until smooth.
#### **Step 4: Assemble the Casserole**
Spread the **cooked sausage** evenly in the baking dish.
Sprinkle **cheese, bell peppers, and onions** over the sausage.
Pour the **Bisquick mixture** evenly over the top.
#### **Step 5: Bake & Serve**
Bake for **35-40 minutes**, or until the center is set and golden brown.
Let cool for **5 minutes**, then slice and serve warm.