Brown Butter Sugar Cookie Bars with Salted Caramel Buttercream

INGREDIENTS

For the Brown Butter Sugar Cookie Bars:

13 tbsp

unsalted butter, melted until browned

1 1/2 tsp

vanilla extract

1 cup

dark brown sugar

1/2 cup

granulated sugar

large eggs, at room temperature

2 cups

plus 2 tablespoons all-purpose flour

1/2 tsp

salt

For the Salted Caramel Butter Cream:

1/2 cup

butter or margarine

1 cup

packed brown sugar

1/4 cup

milk

3 1/2 cups

powdered sugar

Course Sea Salt for Sprinkling