What you will need:
3 cups confectioners' sugar
1 to 2 tablespoons whipping cream
2 t dulce de leche
Add vanilla and cream and continue to beat on medium speed for 1 minute more, adding more cream if needed for spreading consistency.
Fold in 2 T of dulce de leche into the frosting.
Put a teaspoon or less depending on how much dulce de leche you like on the scooped out portion.
With the buttercream frosting cover and decorate your cupcakes.