Step 1: Prep the oven and pan - Preheat your oven to 425 degrees. Line a large baking sheet with parchment paper and set it aside. This makes cleanup easier and keeps everything from sticking.
Step 2: Season the vegetables - In a large bowl, add the sliced baby golden potatoes, broccoli, vegetable oil, garlic powder, onion powder, pepper, and salt. Stir everything well so the vegetables are evenly coated with oil and seasoning.
Step 3: Arrange the vegetables - Pour the seasoned vegetables onto one side of the prepared baking sheet. Spread them out into an even layer, making sure to leave space on the other side of the pan for the chicken.
Step 4: Prepare the chicken - Lay the chicken breasts on the empty side of the baking sheet. If the chicken breasts are very thick, slice them in half or gently pound them to an even thickness so they cook evenly.
Step 5: Make the creamy Parmesan topping - In a medium bowl, combine the grated Parmesan cheese, cream of chicken soup, minced garlic, and chopped parsley. Stir until everything is fully mixed and smooth.
Step 6: Top the chicken - Spread the creamy Parmesan mixture evenly over the top of each chicken breast. Do not worry if some of it drips onto the pan. That extra sauce is gold.
Step 7: Bake - Place the baking sheet in the oven and bake for 20 to 30 minutes. Stir the vegetables every 10 minutes so they roast evenly. The chicken is done when it is cooked through and the topping is golden in spots.
Step 8: Serve - Remove the pan from the oven and let it rest for a few minutes. Serve as is or alongside mashed potatoes for an extra comforting meal.