Preheat the oven: Set your oven to 425°F (220°C).
A hot oven is key for crispy skin and caramelized potatoes.
Prep the pan: Line a large rimmed sheet pan with parchment for easy cleanup, or lightly oil the pan to prevent sticking.
Dry the chicken: Pat the chicken thighs dry with paper towels. Dry skin = crisp skin. Place them on the pan, spacing them out.
Season the potatoes: In a bowl, toss potato chunks and onion wedges with 2 tablespoons olive oil, 1 teaspoon salt, plenty of pepper, smoked paprika, thyme, and oregano. Add the garlic and toss again.
Arrange on the pan: Scatter the potatoes and onions around the chicken. If adding cherry tomatoes or peppers, wait until later so they don’t overcook.
Oil and season the chicken: Drizzle the thighs with 1–2 tablespoons olive oil.
Sprinkle generously with salt, pepper, smoked paprika, and a pinch of thyme.
Roast: Bake for 35 minutes. Rotate the pan halfway through for even browning.
Add quick-cooking veggies (optional): If using cherry tomatoes, bell peppers, or trimmed green beans, toss them with a little oil and salt and add to the pan after the first 20 minutes.
Check doneness: The chicken is done at an internal temperature of 165°F (74°C). The potatoes should be tender and golden at the edges.
Finish with lemon: Zest half a lemon over the pan, then squeeze a little juice on the potatoes for brightness.
Slice the remaining lemon into wedges for serving.
Optional broil: For extra-crispy skin, broil on high for 1–2 minutes. Watch closely—things crisp fast.
Garnish and serve: Scatter chopped parsley over the top. Serve directly from the pan with lemon wedges.