5.4 ounces dark chocolate
1 cup + 6 tablespoons butter
1 3/4 cups + 2 tablespoons sugar
6 eggs
1 cup + 2 tablespoons flour
4 1/2 tablespoons cocoa
1 1/2 teaspoon baking powder
pinch of salt

Heat oven to 350°F. Line muffin pan with paper cupcake liners. Melt chocolate and butter together. Add sugar and stir to combine. Let mixture cool for 10 minutes. Beat with an electric mixer for 3 minutes. Add one egg at a time, mixing for 30 seconds between each. Sift dry ingredients into the mixture and mix till blended. Spoon into prepared muffin cups and bake 25 minutes till a toothpick comes out clean.