Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the chicken sausage into 1/2-inch thick rounds and set aside.
De-seed the red and green bell peppers and slice them into 1/2-inch wide strips.
Peel the red onion and cut it into thin wedges, keeping the root end intact if possible to help them stay together.
Drain and rinse the chickpeas, then pat them thoroughly dry with a paper towel to ensure they get crispy in the oven.
Place the sausage, peppers, onion, and chickpeas onto the prepared sheet pan.
Drizzle with the extra virgin olive oil and sprinkle evenly with dried oregano, garlic powder, sea salt, and black pepper.
Toss all ingredients together with your hands or tongs until everything is well-coated in oil and spices, then spread into a single layer.
Roast for 20-25 minutes, tossing halfway through the cooking time, until the sausage is browned and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately while hot.