Preheat oven to 425 F. In a large bowl, add mayo, onion powder, smoked paprika and salt. Whisk well with a fork.
Add chicken thighs and using tongs, toss to coat completely. Now you can bake them immediately or marinate for up to 24 hours for more flavor.
Arrange chicken thighs in a tight single layer in large 9x13 baking dish and bake uncovered for 20 minutes or until instant read thermometer inserted in the thickest part registers at least 160 F.
Remove chicken thighs from the oven, cover with foil and let rest for 5 minutes. Serve hot with your favorite side dishes!
Notes
Store: Leftovers keep well in the fridge for up to 5 days. They are perfect for meal prep and taste amazing cold.
Freeze: Freeze in an airtight container for up to 3 months. Thaw in the fridge overnight.
Reheat: Covered in preheated to 350 degrees F oven for about 10 minutes.