Mix all of the cake substances right into a microwave-safe mug. This can be a smaller cake, so utilizing an Eight ozmug needs to be fantastic. Whisk with a small whisk till batter is clean and no lumps stay.
In a separate small bowl, mix cinnamon swirl substances. Microwave briefly, about 20-30 seconds, or till butter melts. (I like to recommend overlaying prime with paper towel earlier than microwaving.) Stir and blend till it turns into a uniform, thick syrup. Pour right into a small liquid container that has a slender pouring spout.
Working shortly (you don’t need the butter to chill as your swirl will turn into arduous to pour), scoop out half of the cake batter and put aside. Pour a swirl into the remaining batter within the mug. (If you’re having points pouring a swirl, it’s also possible to use a fork or whisk and draw within the swirl. Simply elevate the utensil from the syrup a number of instances till you’ve a single stream earlier than drawing your swirl.) Pour the remainder of the batter again in, ensuring to cowl the cinnamon swirl fully. Pour one other cinnamon swirl on prime. It is okay should you nonetheless have a bit of leftover of the cinnamon combine.
Cook dinner cake in microwave for about 1 minute till cake elements are fully cooked. The butter from the cinnamon swirl may separate barely throughout cooking which is able to trigger the cinnamon swirl to be a bit of gooey and moist nevertheless it’ll solidify and sink in because the cake cools.
Whereas cake is cooking, make the frosting. In a medium bowl, add substances. Heat in microwave barely, about 10 seconds. Make certain to cowl bowl with paper towel earlier than heating. Utilizing a very good whisk (I used an even bigger one than the one for the mug cake batter), whisk till uniform and frosting thickens. Scoop frosting right into a piping bag and pipe frosting onto cake. You need to have sufficient to frost two truffles. It can save you the remaining for one more time.