1. Preheat oven to 350?. 2. Lightly spoon flour into dry measuring cups, and level with a knife. Combine flour, sugar, and salt in a bowl; cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal. Combine 1/3 cup flour mixture and candy bar for topping; set aside. 3. Stir baking powder and baking soda into remaining flour mixture in bowl; add yogurt, milk, rind, vanilla, and egg whites. Beat at medium speed of a mixer until blended. Spoon batter into an 8-inch round cake pan coated with cooking spray. Drop marmalade by teaspoonfuls onto batter; swirl together using the tip of a knife. Sprinkle topping over batter. Bake at 350? for 35 minutes or until a wooden pick inserted in center comes out clean. Cool in pan on a wire rack. Yield: 8 servings (serving size: 1 wedge). Calories 237 (30% from fat); FAT 7.8g (sat 4.8g, mono 1.9g, poly O.5g); PROTEIN 3.8g CARB 37g; FIBER 0.5g; CHOL l6mg; IRON 0.9mg; SODIUM 210mg; CALC 57mg Recipe by: Cooking Light, March 1999