PREHEAT oven 350°F. Lay one sheet of phyllo on work surface. Brush with butter; fold in half to make 12x8-inch rectangle. Brush top with butter; cut into 2-inch squares. Stack 2 squares, on an angle, to make 4 thicknesses; press 1 stack into each of 36 miniature (1-1/2-inch) muffin cups.