Preheat your oven to 425°F and line a large sheet pan with parchment paper for effortless cleanup. Allow the oven about five minutes to reach temperature while you prep your ingredients, ensuring everything cooks evenly.
Combine all diced vegetables in a large mixing bowl, then drizzle with olive oil and sprinkle the smoked paprika, garlic powder, onion powder, salt, and black pepper. Toss everything until vegetables glisten with seasoning, taking about one minute to coat thoroughly.
Spread the seasoned vegetables across your sheet pan in a single layer, creating space in the center for the sheet pan chicken sausage recipe components. This arrangement allows hot air to circulate properly, promoting golden caramelization on every surface.
Nestle the halved baby potatoes among the vegetables first, then place chicken sausage links on top, spacing them about two inches apart. Roast the entire pan for 18-20 minutes, stirring vegetables halfway through to ensure even cooking and beautiful browning.
The sausages are done when browned and firm to the touch, and potatoes should pierce easily with a fork. Remove from the oven, squeeze fresh lemon juice over everything, scatter chopped parsley across the top, and serve immediately while hot.