Chocolate Fudge Brownies with Whipped Peanut Butter Frosting

INGREDIENTS

For the brownies:

10 tbsp

unsalted butter, at room temperature

1 cup

sugar

3/4 cup

plus 2 tbsp. unsweetened cocoa powder

1/4 tsp

salt

1/2 tsp

vanilla extract

large eggs, cold

1/2 cup

all-purpose flour

For the frosting:

6 tbsp

unsalted butter, at room temperature

3/4 cup

creamy peanut butter

1 cup

confectioners’ sugar

salt

To finish:

Additional sea salt, such as fleur de sel, for sprinkling