Pour drippings and loosened browned bits into a 2-cup measuring cup. Skim fat, reserving 1/4 cup. Add enough broth to the drippings to measure 2 cups.
In a small saucepan, combine flour and reserved fat until smooth. Gradually stir in the drippings mixture. Stir in the thyme, sage and pepper. Bring to a boil; cook and stir until thickened, about 2 minutes.