Preheat your oven to 425°F (220°C).
Prepare the chicken thighs by patting them dry with a paper towel.
In a large bowl, combine olive oil, garlic powder, smoked paprika, salt, black pepper, and thyme.
Add the chicken thighs to the bowl and coat them evenly with the spice mixture.
Arrange the chicken thighs on a baking sheet, skin-side up, and place lemon slices around them.
Bake in the preheated oven for 35-40 minutes, or until the internal temperature reaches 165°F (74°C).
Once done, let the chicken rest for 5-10 minutes before serving.