Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Slice the chicken sausage into half-inch thick rounds and chop the bell pepper, zucchini, and broccoli into uniform, bite-sized pieces.
Place the sliced sausage and all the chopped vegetables onto the prepared baking sheet.
Drizzle the olive oil over the mixture, then sprinkle evenly with garlic powder, dried oregano, sea salt, and black pepper.
Use your hands or a spatula to toss everything together until the sausage and vegetables are well-coated in oil and spices.
Spread the mixture out into a single layer, ensuring the pieces aren't too crowded so they roast rather than steam.
Bake for 20 to 25 minutes, tossing the ingredients halfway through, until the vegetables are tender and the sausage has developed a golden-brown exterior.
Remove from the oven and garnish with freshly chopped parsley before serving hot.