Let's cook.
Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper for easier cleanup.
In a large bowl, combine the sliced bell peppers and onion wedges. Drizzle with olive oil, then sprinkle with dried oregano, garlic powder, salt, and black pepper. Toss until the vegetables are evenly coated.
Add the 1-inch pieces of Italian sausage to the bowl with the seasoned vegetables. Toss gently to combine everything.
Spread the sausage and vegetable mixture in a single layer on the prepared baking sheet. Ensure there is some space between the pieces for even roasting.
Roast for 25-30 minutes, flipping the ingredients halfway through, until the sausage is cooked through and browned, and the vegetables are tender-crisp and slightly caramelized.
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