Stir together KELLOGG'S ALL-BRAN cereal and milk in medium mixing bowl. Let stand about 2 minutes or until cereal softens.
In medium mixing bowl, stir together flour, onion and caraway seed. Using pastry blender, cut in margarine until mixture resembles coarse meal. Stir in cereal mixture. Shape dough into ball.
Roll out to 1/16-inch thickness on floured surface. Cut into 2-inch circles or shapes. Prick several times with fork. Sprinkle with coarse salt, if desired. Place on ungreased baking sheets.
Bake at 350° F about 10 minutes or until lightly browned. Remove from baking sheets. Cool on wire racks.
Yield: 3 dozen (36) crackers