Heat oven to 350°F. Spray 36 mini-size muffin tins with vegetable cooking spray. In large bowl, stir together whole-wheat flour, all-purpose flour, wheat germ, sugar, baking powder, and salt. Stir in white cheddar cheese, ham, and corn. In another bowl, whisk together skim milk, egg whites, and vegetable oil. Stir wet ingredients into dry until just blended. Spoon into greased muffin tins and bake 18 minutes.