4 ounces (4, 1oz squares) unsweetened baker's chocolate, chopped
2 sticks (8 ounces or 16 tablespoons) butter
2 cups raw sugar (can substitute granulated white sugar if necessary)
4 large eggs
1 cup (4 1/4 ounces by weight) all-purpose flour
1 teaspoon baking powder
1/4 teaspoon kosher salt
1 teaspoon pure vanilla extract
1 stick (4 ounces or 8 tablespoons) butter, softened to room temperature
1/3 cup Nutella
2 tablespoons creamy peanut butter
1 pound (4 cups) powdered sugar
2-4 tablespoons whole milk or heavy cream
1 teaspoon pure vanilla extract
Maldon Sea Salt Flakes