Refrigerator Bran Muffins

Ingredients 3/8 cup shortening or margarine 1 cup of sugar 2 eggs 1 1/2 cup wheat bran 2 ½ cups whole wheat flour (use some white if preferred) 1 tsp salt 1 tbsp. baking powder 1 ½ tsp soda 1/2 cup raisins 1 1/2 cups buttermilk or sour milk (Sour milk by adding about...