Prep the oven and pan: Preheat oven to 425°F (220°C). Line a sheet pan with foil and set a wire rack on top for better airflow.
If you don’t have a rack, use the pan directly.
Dry and season the chicken: Pat drumsticks very dry with paper towels. In a large bowl, toss with olive oil, salt, pepper, onion powder, smoked paprika, and thyme until evenly coated.
Roast for crisp skin: Arrange drumsticks on the rack with space between. Roast for 35–40 minutes, turning once halfway, until skin is golden and internal temperature hits 175–185°F (80–85°C) for tender, pull-from-the-bone meat.
Make the lemon butter: While the chicken roasts, melt butter in a small saucepan over low heat.
Add garlic and cook 30–45 seconds until fragrant. Stir in lemon zest and 2–3 tablespoons lemon juice. Season with a pinch of salt and pepper.
Keep warm on low.
Finish under high heat (optional): For extra crispness, broil the drumsticks for 2–3 minutes at the end, watching closely.
Glaze and rest: Transfer hot drumsticks to a bowl, pour over the lemon butter, and toss to coat. Rest 5 minutes so the juices settle and the sauce soaks in.
Garnish and serve: Sprinkle with chopped parsley and a final squeeze of lemon if you like. Serve with roasted asparagus, sautéed zucchini, or a simple green salad.