Preheat oven to 450
Slice lemons, onions, and garlic and set aside 6 lemon slices separately
Whisk together olive oil, thyme, 1 tbsp salt and 1 tsp pepper
Scatter onions, lemon, and garlic slices on the bottom of a 12” cast iron pan
Set chicken thighs on top, skin side down. Brush olive oil mixture on the bottom of the chicken, then flip it over
Pat chicken skin dry with paper towels, tuck lemon slices under each thigh skin, and then brush on the remaining oil herb mixture
Season with salt and pepper, and drop in pads of butter
Put into the oven for 25-30 minutes. Then, pour white wine into the pan between the chicken thighs, being careful not to pour on top of the chicken skin so that it stays crispy. Bake for another 10ish minutes
Take out and let rest for a few minutes, then serve!