Make the brownies: In a large heat-proof bowl, place chocolate and butter, and heat in the microwave in 20-second intervals, stirring in between each interval until melted (or set over a saucepan of simmering water, stirring occasionally).Add sugar and whisk until combined. Stir in vanilla extract. Whisking together the Eggs and Sugar for a few minutes will make the crumb light and soft, and create the slightly “cracking” effect you often find in brownies. https://www.amodernhomestead.com/how-to-make-brownies-from-scratch The best way to make fudgy, moist Chocolate Muffins is to follow the same process as you would for a brownie. Add eggs, one at a time, and whisk just until combined. https://www.yummly.com/recipes/brownie-muffins-with-brownie-mix https://www.savoryexperiments.com/how-to-make-box-brownies-better How to make Muffin Tin Brownies.