Stir rapidly with wooden spoon until flour absorbs liquid and forms ball, pulling away from sides of pan. Stir vigorously until film forms on bottom of pan and dough is no longer sticky, 1 to 2 minutes longer.
Stir in cheese and pepper.
Drop rounded tablespoonfuls of dough onto baking sheets, spacing about 3 inches apart. Using damp fingertip, press down any peaks of dough.