Heat oven to 375°F. In large bowl, mix cookie mix, flour, butter and egg until dough forms. Divide dough in two; cover bowl with plastic while working on first batch. Place one-fourth of the dough on lightly floured surface. Roll to 1/4-inch thick. Cut cookies with 3 1/2-inch round cutter. Place on ungreased cookie sheet. Bake 5 to 7 minutes or until edges are light golden brown. Cool on cookie sheet 2 minutes before removing to cooling rack. Repeat with remaining dough.