Crock Pot Apple Butter 3 QT. Recipe By Robin Put 3 quarts of apples, sliced thin, in a crock pot and cook overnight on high. Next morning, add 1/2 teaspoon cinnamon, 3 cups sugar. Cook all day on low. Tastes like old-fashioned apple butter that is cooked in copper kettle. You can use applesauce if you do not have time to prepare the apples. The crock pot makes it possible for apples to cook a long time without being stirred.