In a large bowl, beat butter, sugar, vanilla and egg with a whisk. Stir in remaining ingredients.
Shape dough into 10″ X 3″ log on plastic wrap. Wrap and refrigerate about 2 hrs or until firm. The dough will keep in the fridge for about a week, but I’d recommend freezing it if you plan on using it more than 3 days later.
Heat oven to 375 degrees.
Cut dough into 1/8″ slices. On ungreased cookie sheet or parchment paper, place slices 2″ apart.
Bake 6-8 mins. or till light brown on bottoms. Cool before removing from cookie sheet to wire rack.
Fill with Dulce de leche or caramel and top with melted chocolate. Serve to your favourite Cookie Monster with ice cold milk*.
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