Marbled Sugar Cookie Squares

Heat oven to 350°F. Line 13x9-inch pan with foil, extending foil over edges.

In medium bowl, crumble dough; stir or knead in flour until well mixed. Divide dough into 3 equal portions. Place 2 dough portions in 2 small bowls. Stir or knead in green gel food color into 1 bowl and red gel food color into other bowl. Leave third dough portion white. Drop tablespoonfuls of all colors of dough in random pattern into pan. Press dough evenly into bottom of pan so that each color just touches.

Bake 12 to 16 minutes or until edges are light golden brown. Cool completely, about 1 hour. Use foil to lift from pan; pull foil away from edges. Cut into 6 rows by 4 rows. Store in airtight container at room temperature up to 1 week.