Add Yahoo as a preferred source to see more of our stories on Google. You’re whipping up so much homemade sourdough, you’re basically running a bakery out of your kitchen now. But with all that bread ...

The idea sounds like a prank straight from a college dorm: Bread in a mug, no oven, no yeast, no kneading, and ready in the time it takes to reheat yesterday's coffee. But this tiny miracle is real.