Baked Corn Pudding

A delicious side filled with old-fashioned good taste! Can also be served as a meatless main dish. 1/4 cup butter or margarine 2 tablespoons finely chopped onion 1/4 cup all-purpose flour 1/4 teaspoon salt 1/4 teaspoon pepper 1/4 teaspoon garlic powder 2 cups milk 3...