Combine first 5 ingredients in a large bowl; stir well. Stir in cheese and green onions. Make a well in center of mixture.
Whisk together egg, milk, and butter; add to dry ingredients, stirring just until moistened. Spoon into lightly greased muffin pans, filling three-fourths full.
Bake at 375° for 22 minutes or until a wooden pick inserted in center comes out clean. Remove from pans immediately, and serve warm.