Dulce de Leche Cinnamon Sandwich Cookies

INGREDIENTS

1 cup

Butter, softened

1 cup

Sugar (plus ½ cup for rolling)

Egg

2 tsp

Vanilla Extract

2 cups

Flour

1 tsp

Baking Soda

1/2 tsp

Salt

2 tsp

Cinnamon (to be mixed with remaining ½ cup of sugar for rolling)

Dulce de Leche Filling:

1 tbsp

Butter

1 oz

can Dulce de Leche (such as Nestle Dulce de Lechera)