Step 1: Prep the oven and pan : Preheat oven to 400°F (200°C).Line a large baking sheet with parchment paper for easy cleanup.
Step 2: Season the chicken : Pat chicken dry with paper towels.Season both sides with salt, pepper, and paprika.
Step 3: Make the garlic butter sauce : In a small bowl, mix melted butter, minced garlic, lemon juice, and Italian herbs.
Step 4: Prepare the vegetables : Place broccoli, carrots, bell pepper, and zucchini in a large bowl.Toss with olive oil, salt, and pepper. Spread vegetables evenly on the baking sheet.
Step 5: Assemble and roast : Nestle chicken breasts among the vegetables on the baking sheet.Brush chicken generously with garlic butter sauce (reserve some for basting later). Roast for 20 minutes.
Step 6: Baste and finish cooking : Remove pan from oven, brush chicken with remaining garlic butter.Return to oven and roast another 8–10 minutes, or until chicken reaches an internal temperature of 165°F (74°C).
Step 7: Rest and serve : Let chicken rest for 5 minutes before slicing.Serve hot with roasted vegetables on the side.