Preheat the oven to 450
Cut two slashes down to the bone on the skin side of each chicken thigh. Rub with oil and season with Cajun and Italian seasonings.
Slice onion, peppers, and potatoes. Mix in a large mixing bowl with Cajun, Italian herbs, salt, and pepper. Drizzle with oil and mix until all ingredients are coated.
Transfer mixture onto 2 large, foil lined roasting pans. Evenly space chicken thighs with the skin facing up and position potatoes near the top.
Roast for 25min.
With 10 min left, Heat 1 tablespoon oil in a skillet over medium heat. Add sausage links and cook until browned and fat begins to render, about 3 minutes per side. While they cook, lightly pierce sausages in several places with the tip of a sharp knife to release fats and juices. Remove from the heat and place on a cutting board to cool slightly, 3 to 5 minutes.
Cut cooled sausages into 2-inch slices; add evenly to the roasting pans and roast for an additional 20 min.
