What you need:
1 pouch (1 lb 1.5 oz.) Betty Crocker sugar cookie mix
1/2 cup butter, softened
1 cup M&M’s chocolate candies
1 cup white vanilla baking chips
Heat oven to 350 degrees F. Spray bottom only of 13×9-inch pan with cooking spray.
In large bowl, mix cookie mix, butter and egg with spoon until soft dough forms. Stir in 1/2 cup of the candies and the white vanilla baking chips. Press dough in bottom of pan and Sprinkle remaining candies on top.
Bake 22 to 24 minutes or until golden brown. Cool completely for about 1 hour. Cut into 6 rows by 4 rows and store in airtight container.