Preheat oven to 325 degrees
Place each breast between 2 pieces of plastic wrap
Lightly pound each breast to make the flesh more even throughout
Use a rolling pin or the flat side of a meat tenderizer
On a plate stir together flour, thyme, cayenne, 1t salt, 1t white pepper
Heat 3T oil in a large ovenproof skillet (if do not have or too small for all four, cook in patches and place on a oven proof casserole or baking sheet)
Dredge each breast in seasoned flour
Brown on each side for about 2 minutes each on medium high heat
Place in oven and cook for 15-20 minutes or until th internal temperature is 162
Remove from oven and sit in warm place