In a large bowl, sift together the flour, sugar, baking powder and salt. Cut in shortening with 2 knives or pastry blender until the consistency of corn meal. Mix well and put in an airtight container. Store in a cool, dry place or in the refrigerator, if you have the space. Use within 10 to 12 weeks. Makes about 16 cups
Plain Cake:
2 cups cake mix
1 tsp. vanilla
1 egg, slightly beaten
1/2 cup milk
Stir ingredients for plain cake until well blended. Pour into 8-inch square pan. Bake at 350 degrees F for 25 to 30 minutes. For a 9 x 13-inch pan or layer cakes, double the ingredients.