Mini Hamburgers

1/2 cup chopped onion
1 tablespoon butter or margarine
1 pound lean ground beef or ground round
1 egg, beaten
1/4 teaspoon seasoned salt
1/4 teaspoon ground sage
1/4 teaspoon salt
1/8 teaspoon pepper
40 mini rolls, split
8 ounces process American cheese slices, cut into 1-1/2-inch squares
40 dill pickle slices, optional

In a skillet, saute onion in butter. Transfer to bowl; add meat, egg and seasonings. Spread over bottom halves of the rolls; replace tops. Place on baking sheets; cover with foil.

Bake at 350 degrees for 20 minutes. If desired, place a cheese square and pickle on each hamburger; replace tops and foil and return to the oven for 5 minutes. Makes 40 servings.