Preheat oven to 350.
Add cake mix, eggs, butter, brown sugar & vanilla extract..stir with spoon until thoroughly blended. Stir in chocolate chips and marshmallows & heath bar. Or nuts.
Drop small teaspoonfuls on greased baking sheet. They spread..
Bake at 350 for 12 mins for chewy cookies or 14 minutes for crisp cookies Cool 2 minutes on baking sheets. Remove to cooling rack. Cool completely. Store in airtight container.
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