Preheat the grill for medium high heat. Lightly oil the grill grate.
Mix together paprika, garlic powder, salt, onion powder, thyme, cayenne pepper, and ground black pepper in a bowl. Set aside 3 tablespoons spice mixture; store remainder in an airtight container for later use.
Rub reserved 3 tablespoons spice mixture all over chicken breasts.
Cook chicken on the preheated grill until juices run clear, 6 to 8 minutes on each side. An instant read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).
Spicy Chicken Breasts · Dinner Match Lab | Dinner Match Lab