Saute onion in 2 Tablespoons butter until tender. In a bowl, combine onions with egg, sour cream, and pepper. Mix well. Set aside. Add flour and baking powder to another bowl. Cut in 1/4 cup butter until crumbly and fine. Stir in half the cheese. Add milk to make a soft dough. Pat dough into a buttered 9 inch square pan. Spread sour cream on top. Sprinkle with remaining cheese and parsley. Bake in oven at 425 degrees for 25 minutes. Cut into squares. Serve warm.
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