What you need: 1 stick plus 1 tablespoon unsalted butter, plus melted butter for brushing 1 tablespoon unsweetened cocoa powder 1/4 cup plus 1 tablespoon all-purpose flour 6 ounces dark chocolate (70 percent cacao), chopped 3 tablespoons creamy peanut butter 1 tablespoon confectioners' sugar, plus more for sprinkling 1/2 cup granulated sugar 3 large eggs, at room temperature Pinch of salt What to do: 1. Preheat the oven to 425°. Brush four 6-ounce ramekins with melted butter.