280g (19½ tablespoons) unsalted butter, softened at room temperature
300g (1⅞ cups) powdered sugar
33 milliliters (2¼ tablespoons) milk, any type
11 milliliters (2 teaspoons) vanilla extract
1g (1/8) teaspoon salt
Instructions
For the Brownies:
Pre-heat oven to 350 degrees;
Line a 9x13 baking pan with parchment paper; set aside
In a medium bowl, whisk together flour and salt; set aside
Melt butter and chocolate in large pot over low to medium heat; remove when melted
Stir in sugar until combined; stir in eggs, espresso and vanilla until smooth
Whisk in flour mixture just until combined; do not overmix
Pour batter into prepared baking dish and bake 40-45 minutes or until a knife comes out clean
Set brownies aside to cool completely before removing from pan prepare frosting
For the Buttercream:
In the bowl of an electric mixer with a paddle attachment, beat butter on medium speed for eight minutes or until pale and creamy
Add half of powdered sugar, mix on low for 30 seconds
Add remaining powdered sugar, milk, vanilla and salt; mix on low for one minute and then increase speed to medium and beat for six minutes or until very light and fluffy
Use a flat metal spatula to frost the brownies
Notes
Buttercream recipe source: Sweetapolita Brownies can be baked ahead of time (store well-wrapped in freezer up to one month or at room temperature up to three days); frost day of serving for best results
Recipe by Keep It Sweet Desserts at http://www.keepitsweetdesserts.com/fudgy-brownies-with-fluffy-vanilla-buttercream/