Set your oven to heat at 400°F (200°C) and prepare a large sheet pan lined with parchment paper.
Dry the chicken pieces with a paper towel and sprinkle both sides evenly with garlic powder, paprika, salt, and black pepper.
Combine melted butter with minced garlic, lemon juice, and Italian seasoning in a small bowl and mix well.
Arrange the halved baby potatoes on the sheet pan, drizzle with olive oil, sprinkle salt and pepper, then place in the oven for 15 minutes.
Remove the pan, place the seasoned chicken on it, coat broccoli and asparagus with half of the garlic butter mixture, and arrange veggies around the chicken.
Return the sheet pan to the oven and bake for 20-25 minutes, until the chicken is fully cooked with an internal temperature of 165°F (75°C).
During the last 5 minutes, pour the remaining garlic butter sauce over the chicken and vegetables.
(Optional) Turn the oven to broil and crisp the dish under heat for 2-3 minutes to get a golden top.
Remove from oven, plate the food, and serve hot.