1 cup confectioners' sugar
1/2 cup creamy peanut butter (see Cook's Note)
4 tablespoons unsalted butter, at room temperature
1 teaspoon pure vanilla extract
1/4 teaspoon kosher salt
6 ounces bittersweet chocolate, roughly chopped
We tested these with both regular and natural peanut butter. Either variety will work, but the regular peanut butter lends a creamier consistency that we prefer.