In a large skillet, cook beef until no longer pink; drain and cool. Stir in the cheddar cheese, cottage cheese, eggs and pepper; mix well.
Cut pastry into eight 5-in. squares, 1/4-in. thick. Place heaping 1/3 cupfuls of meat mixture in center of squares. For each square, fold one edge over filling to form a triangle. Moisten edges with water; press together with a fork to seal.
Place on an ungreased baking sheet; bake at 400° for 20 minutes or until golden brown.
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