You're only going to need ONE pan and a few easy ingredients on hand to make this weeknight rosemary roast chicken and potatoes.---you've got dinner in the bag!
Preheat oven to 400F. Lightly grease a large baking sheet and arrange chicken, potatoes, and onion on sheet. Set aside.
In a small bowl, whisk remaining ingredients until smooth. Divide in half and drizzle one half over potatoes, chicken, and onions and set remaining half aside.
Bake chicken at 400F 35-40 minutes or until chicken registers 165F and potatoes and onions are tender. Remove from oven and drizzle remaining sauce over all. Serve warm and enjoy!