1Heat oven to 425°F. Spray 24 miniature muffin cups with nonstick cooking spray. Place muffin pans on cookie sheet. Add 1/8 teaspoon oil to bottom of each cup.
2In small bowl, combine milk, egg and egg white; beat well with wire whisk. Lightly spoon flour into measuring cup; level off. Lightly spoon flour into measuring cup; level off. Add flour; beat until smooth. Stir in cheese.
3Place pans on cookie sheet in oven for several minutes to heat. Remove cookie sheet from oven; quickly divide batter evenly into hot muffin cups, filling each cup about 2/3 full.
4Bake at 425°F. for 18 to 20 minutes or until popovers are puffed and deep golden brown. Immediately remove from muffin cups. Serve warm.