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Empty jar of cookie mix into large mixing bowl. Use your hands to thoroughly blend mix.
Add 1 stick butter or margarine, melted, 1 egg, slightly beaten, and 1 teaspoon vanilla extract.
Mix until completely blended. You will need to finish mixing with your hands.
Shape into balls the size of walnuts. Place 2 inches apart on sprayed baking sheets.
Bake at 350 degrees F for 11 to 13 minutes until edges are lightly browned.
Cool for 5 minutes on baking sheet.
Remove cookies to racks to finish cooling.