Preheat and prep: Heat the oven to 425°F (220°C).
Line a large sheet pan with parchment for easy cleanup. Pat chicken thighs dry with paper towels.
Season the chicken: In a small bowl, mix 1 teaspoon salt, 1/2 teaspoon black pepper, oregano, paprika, and thyme. Rub with 1 tablespoon oil, then coat thighs evenly with the spice mix.
Add lemon zest over the top for brightness.
Arrange on the pan: Place thighs skin-side up on one side of the sheet pan. If using bone-in, leave extra space for air flow so the skin crisps.
Prep the vegetables: Chop broccoli into florets, slice zucchini into half-moons, and cut bell pepper and red onion into strips. Toss with 2 tablespoons oil, 1/2 teaspoon salt, and a pinch of red pepper flakes.
Roast: Spread vegetables on the remaining space of the sheet pan.
Roast for 20 minutes.
Baste for flavor: Melt butter with minced garlic in a small pan until fragrant (about 1 minute). Spoon half over the chicken. Toss vegetables lightly with any pan juices.
Finish roasting: Return to the oven for 10–15 minutes, until chicken reaches an internal temp of 165°F (74°C) and the skin is browned.
Broil 2–3 minutes if you want extra crisp skin.
Make the sauce: While the chicken finishes, whisk mayonnaise, sour cream, Dijon, 1 tablespoon lemon juice, a pinch of salt and pepper, and chopped herbs. Adjust with more lemon juice to taste.
Rest and slice: Let chicken rest 5–7 minutes. For bite-sized pieces, remove skin, slice the meat, and then chop the crisp skin to sprinkle over bowls for added texture.
Or keep thighs whole.
Assemble bowls: Divide vegetables among 4–5 containers. Add chicken. Drizzle 1–2 tablespoons sauce over each, or pack sauce separately.
Finish with a squeeze of lemon and a sprinkle of Parmesan if using.