​The key to delicious cupcakes is making sure that you don't overbake them and also don't overmix when you're stirring the ingredients. Once the chocolate mixture is combined, it's time to pour into the liners to bake. Once the time has passed for the cupcakes to bake, insert a clean toothpick into the center. As long as the toothpick comes out clean, the muffins are done baking and ready to cool down.