For a richer flavor, use brown butter instead of softened butter. Feel free to experiment with different extracts, spices, or mix-ins such as chocolate chips, chopped nuts, or berries. If you don't have sour cream, plain Greek yogurt can be used as a substitute. Microwave cooking times may vary. Watch the cake carefully to prevent overcooking.
Lelia Hills
Jun 7, 2025The crumb topping takes this mug cake to the next level. It's so good!
Ebba Oreilly
Apr 30, 2025I added a sprinkle of sea salt to the crumb topping, and it was the perfect sweet and salty combination.
Krista Swift
Feb 2, 2025My kids love making this recipe. It's so easy that they can do it themselves (with supervision, of course).
Alfonzo Heller
Aug 1, 2024This recipe is a lifesaver! I can whip up a delicious treat in minutes without having to bake a whole cake.