In a separate small bowl add melted butter, sugar and ground cinnamon. Mix until combined
2 Tablespoons (24g) butter, melted, 2 teaspoons (8g) white or brown sugar, 1 ½ teaspoons ground cinnamon
Assemble (see notes on tips below)
Spoon some vanilla batter into a mug or ramekin. (See note 1)
Add a bit of the cinnamon sugar mixture over the vanilla layer.
Repeat layering once more with vanilla batter and cinnamon sugar.
Top it off with a final layer of vanilla batter.
Then, gently swirl the top two layers using the tip of a spoon.
Microwave one mug or ramekin at a time. Cook on high power for 1 minute until the cake is done in the middle.
Glaze (optional)
Whisk the powdered sugar and milk together in a small bowl until smooth.
¼ cup (30g) powdered sugar, 2 teaspoons 10ml warm milk
Pour over the cooked Microwave Cinnamon Swirl Cake. (The glaze can be poured over the warm cake)
This cake is best enjoyed immediately after being microwaved.
Recipe Notes
1.In each ramekin, I measured the vanilla batter layers with a teaspoon and the cinnamon layers with a ½ teaspoon.
Tips
Use a wider instead of deeper microwave-safe mug or ramekin when baking for better heat distribution and ample space for rising of the batter.
Mug or ramekin size makes a huge difference: If you’re using a larger mug that is taller then it will take longer to cook. If you’re using a larger but wider mug, it may take less time to cook.
Avoid filling the ramekin or mug with too much batter: Keep in mind that the mixture should be filled only halfway to the rim to avoid spills. This guideline applies to any microwave-safe container, whether it's a mug, cup, or ramekin.
The baking time in my recipe is based on my 1000 watt microwave: This means that your baking time will vary by either a few seconds more or less depending on your microwave.
Do not overbake: Keep in mind that the cake continues to bake for at least another minute after it has been removed from the microwave.
Microwave in short bursts if you're unsure: Microwave the cake in short intervals (usually 30-second increments) to prevent overcooking. Check the cake's progress between each interval to avoid drying it out.