#### **Step 1: Preheat & Prepare**
Preheat oven to **400°F (200°C)**.
Line a **large sheet pan** with parchment paper or aluminum foil for easy cleanup.
#### **Step 2: Season the Vegetables**
In a **large bowl**, toss **sliced bell peppers and onions** with **olive oil, garlic, Italian seasoning, salt, and black pepper**.
Spread the mixture evenly on the sheet pan.
#### **Step 3: Add the Sausage**
Arrange the **sausages on top of the peppers and onions**.
(Optional) Drizzle with **balsamic vinegar** for extra flavor.
#### **Step 4: Bake**
Roast for **25-30 minutes**, flipping the sausages halfway through, until they’re browned and cooked through (**internal temp: 160°F/71°C**).
If desired, broil for **2-3 minutes** for extra crispiness.
#### **Step 5: Serve & Enjoy**
Garnish with **fresh parsley or basil**.
Serve on **hoagie rolls, over rice, or with mashed potatoes**.