Lightly spoon flour into measuring cup; level off. In 4-quart bowl or container, combine 1/2 each of the flour, sugar, baking powder and salt. With fork or pastry blender, cut 1/2 of the butter into mixture until consistency of coarse crumbs. Repeat with remaining ingredients. Transfer to tightly covered container. Store in refrigerator or freezer. Use within 4 weeks. Measure by dipping cup into mix; level off. Return unused mix to refrigerator or freezer. Allow measured mix to come to room temperature before adding additional ingredients as directed in recipes.

sugar, baking powder, salt and butter in food processor bowl with metal blade. Process mixture until consistency of coarse crumbs. Transfer to tightly covered container. Repeat with remaining ingredients.