Make the marinade. Mix the oil, lemon juice, garlic and and herbes de Provence in a measuring cup. Season generously with salt and pepper.
Put the chicken thighs in a zippered plastic bag. Add the marinade, seal the bag and work the marinade around the chicken to evenly coat it. (You can also use a glass baking dish or plastic container just large enough to hold the chicken in a single layer. Don’t use a metal pan because the lemon juice will react with it.) Marinate the chicken in the fridge for at least 2 hours and up to 6 hours, turning it at least once to redistribute the marinade.
Take the chicken from the fridge and let it warm on the counter while you preheat the oven, either to 375ºF in convection mode or 400ºF conventional.
Place a baking rack on a rimmed baking sheet (lining the sheet with a silicone baking mat will make clean-up easier) and arrange the chicken skin side up on the rack.
Bake the chicken for about 30 minutes, rotating the baking sheet halfway through. Chicken should be brown with crisp skin and an instant read thermometer should register at least 165ºF when inserted into the thickest part of the thigh. Bake a little longer, if necessary.
Transfer to a platter and serve.