*To make 3/4 cup sour milk, place 1 tablespoon lemon juice or vinegar in a glass measuring cup. Add enough milk to make 3/4 cup total liquid; stir. Let stand for 5 minutes before using.
Cover and refrigerate any leftover muffins. To reheat, place desired amount of muffins in a 350° oven for 10 to 15 minutes or until heated through. Or, place 1 or 2 muffins at a time in a microwave oven and cook on 100% (high) for 20 to 30 seconds or until heated through.