Preheat oven to 400°F and line a baking sheet with parchment paper or foil for easy cleanup.
Pat the boneless, skinless chicken thighs dry with paper towels to help the seasoning adhere and promote a slightly crispy exterior.
In a small bowl, whisk together salt, black pepper, garlic powder, onion powder, smoked paprika, and dried thyme.
Drizzle olive oil over the chicken thighs, then evenly sprinkle the seasoning blend on both sides and rub to coat each piece.
Arrange the seasoned thighs in a single layer on the prepared baking sheet, making sure they aren’t crowded, and bake for 20–25 minutes.
Check doneness with an instant-read thermometer inserted into the thickest part of a thigh— it should register 165°F.
Remove the chicken from the oven and let it rest on the baking sheet for 5 minutes before slicing or serving.