Peanut Butter Brownies with Whipped Chocolate Ganache Frosting

INGREDIENTS

Egg yolk, large

Eggs, large

12 oz

Reese's peanut butter chips

3 oz

All-purpose flour

9 oz

Bittersweet chocolate

2 oz

Chocolate, unsweetened

1 pinch

Salt

1 cup

Sugar

2 tsp

Vanilla extract

4 oz

White chocolate

2 oz

Butter, unsalted

8 ounces (1 liquid cup) heavy whipping cream

5 oz

(1 stick, plus 2 tablespoons) unsalted butter, at room temperature