Fudgy Peanut Butter Brownies with Chocolate Shavings

INGREDIENTS

1 cup

granulated sugar

1/2 cup

all-purpose flour

1/3 cup

dark cocoa powder

1/4 tsp

salt

1/4 tsp

baking powder

eggs, at room temperature

1/2 cup

unsalted butter, melted

1/2 tsp

vanilla extract

1 cup

chocolate chunks

6 tbsp

unsalted butter, softened

3/4 cup

creamy peanut butter

1 cup

confectioners' sugar

dark chocolate bar (for grating over top, optional)