Step 1

In a medium saucepan over high heat, combine sugar, water and butter and bring to a boil.

Step 2

Stir in corn syrup, reduce heat to low, and simmer 1 to 2 minutes; remove from heat.

Step 3

Add peanut butter, marshmallow crème, and vanilla and stir until blended. Refrigerate 30 minutes or until thickened.