Preheat the Oven. Preheat your oven to 425°F and line a large sheet pan with parchment paper or foil for easy cleanup.
Prepare the Ingredients. Slice the sausage into rounds or halves, depending on your preference. Chop all the vegetables into bite-sized pieces for even cooking.
Season Everything. In a large bowl, combine the chopped vegetables and sausage. Drizzle with olive oil and sprinkle garlic powder, paprika, Italian seasoning, salt, and pepper. Toss until everything is evenly coated.
Arrange on the Sheet Pan. Spread the sausage and vegetables in a single layer on the prepared sheet pan. Ensure there’s enough space for the veggies to roast and not steam.
Roast to Perfection. Place the sheet pan in the oven and roast for 25-30 minutes, stirring halfway through, until the sausage is golden and the vegetables are tender with caramelized edges.
Garnish and Serve. Remove from the oven, garnish with fresh parsley if desired, and serve immediately.