Preheat oven to 350°F.
Whisk together the melted butter, egg, and vanilla extract in a large bowl.
Empty the contents of the jar into the bowl and stir to combine with the egg, melted butter and vanilla extract.
Chill dough in the fridge for 2 hours.
Roll the dough into 1-inch balls and place on a parchment-lined baking sheet 1-inch apart.
Bake for about 10-12 minutes, until firm. Allow to cool.