Heat oven to 425°F. Remove pie crusts from pouches; unroll on work surface. With 3 1/2- or 4-inch round cutter, cut 7 rounds from each crust; discard scraps. In small bowl, mix sugar and cinnamon. Dip both sides of rounds into cinnamon sugar to coat. Fit rounds into 14 ungreased regular-size muffin cups, pressing in gently.