Step 1

Preheat the oven to 350 and line a 9X9 pan with parchment paper.

Step 2

Melt the butter and chocolate over a double boiler. (Or glass bowl over a saucepan with an inch or two of water.) Let cool slightly.

Step 3

Whisk together the dry ingredients, flour, cocoa powder, salt, and espresso if using. Set aside.

Step 4

In the bowl of a stand mixer with the whisk attachment, whisk the eggs, yolks, and sugar for 3 minutes until a pale yellow color.

Step 5

With mixer on low, slowly pour in the melted chocolate. Mix to combine.

Step 6

Add the vanilla and mix to combine.

Step 7

Fold in the dry ingredients. Don’t over mix.

Step 8

Pour batter into the prepared 9X9 pan. Bake for 40-45 minutes. Let cool in pan.

Step 9

Lift brownies out of the pan, top with flaky salt or a dusting of powdered sugar, slice and enjoy!