To make this one by YouTuber Tasty Recipes, start with your basic vanilla magic cake recipe; then, once you’ve poured the batter in the pan, toss some berries on top. They’ll sink to the bottom while the cake bakes, making your fudge and custard layers filled with berry goodness. Yum.
5. Easy Nutella Magic Cake
This recipe from Fabulous Cooking involves mixing some Nutella into the batter — although I wonder if you might be able to make it as a swirl cake, too. It might be worth experimenting with adding warm dollops of Nutella after that batter has been poured into the pan, then swirling it with a knife; the result might be interesting.