2 tablespoons (12 grams) unsweetened cocoa powder (I used Hershey's)
1/2 - 1/8 teaspoon baking powder (1/4 still rises)
Pinch of salt
3 tablespoons (43 grams) unsalted butter, melted
3 tablespoons (45ml) whole milk
1 smallish egg, (weighing around 43 grams out of the shell)
1/4 teaspoon vanilla extract (or 1/2 teaspoon if using imitation vanilla flavoring)
1 oz (28 grams) lightly broken up chocolate of your choice (I use semi sweet or milk chocolate, but anything from chocolate truffles to Nutella are great additions)