Melt chocolate and butter ont the stove.Use a medium sauce pan because you will be mixing in the other ingredients.Stir with a wire wisk until chocolate is melted.Try not to heat up the chocolate too much or for too long or it will burn.
Add the vanilla, powdered sugar, flour, and espresso powder and mix well.
Move the mixture into a large mixing bowl. Add the eggs and egg yolks and beat until well blended.
Pour the batter evenly into the cupcake pan.
Bake for about 12 minutes, then use a toothpick to make sure they're cooked. They should be soft in the middle and a bit firmer on the top and edges.
Inject nutella into the center of the cupcake using a frosting or piping bag or any other icing tool.
Spread peanut butter on top of the cupcake.Garnish with chocolate chips if you'd like.You can also use a little left over espresso powder and sprinkle it on top.