In a large sauce pan, combine sugar and corn syrup. Bring to boil over medium heat.
Remove from heat, add peanut butter and vanilla to mixture and mix until smooth.
Add Cocoa Krispies and Reese's Peanut Butter Cups and mix until all coated.
Drop mixture by spoonful onto waxed paper and allow to cool. Enjoy. (I get about 2 dozen from this recipe. It all just depends on how big you make them.)