Preheat oven to 400 degrees F. Spray a large baking sheet with cooking spray.
Wash the baby potatoes and quarter. Slice an onion and chop broccoli. Be sure to leave the broccoli in slightly larger pieces. Add to a mixing bowl and toss with olive oil and seasonings.
Spread vegetables on the prepared baking sheet.
Add the chicken thighs to the bowl. Season and add enough Parmesan Garlic sauce to coat the chicken. Stir until the chicken is well coated.
Place chicken thighs on the baking sheet with the vegetables. Bake for about 35-40 minutes or until the chicken reaches an internal temp of at least 185 degrees F. Broil for just a few minutes, if desired. Top everything with shredded Parmesan cheese.