15-Minute Big Debbie Oatmeal Creme Pie Mug Cake
A healthier take on the classic Little Debbie treat, this single-serving oatmeal creme pie is made right in your microwave mug. The tender oatmeal cake features warm cinnamon and brown sugar substitute, while light whipped topping creates the signature creamy filling. Perfect for a quick dessert craving without the guilt, this mug cake delivers nostalgic flavors in just minutes. The whole wheat flour and oats add texture and nutrition, while the sugar substitute and light butter keep calories in check. Ideal for portion control or late-night sweet tooth emergencies.
Ingredients
- 2 tbsp whole-wheat flour, or whatever flour you have on handall-purpose flour1:1healthier
Works equally well
- 2 tbsp old-fashioned oats
- 1 tbsp Swerve brown sugar substitute, or another 0-calorie brown sugar swap that measures 1:1 like sugarregular brown sugar1:1standard
Increases calories and carbs
- ½ tsp baking powder
- ¼ tsp cinnamon
- 2 tbsp egg white, about 1 large, or fat-free liquid egg substitute
- 2 tsp light butter, in a tubregular butter1:1standard
Increases calories and fat
- ½ tsp vanilla extract
- 3 tbsp light whipped topping, thawed from frozen
Instructions
- 1
Spray a wide-bottomed microwave-safe mug with nonstick spray
- 2
Add flour, oats, brown sugar substitute, baking powder, and cinnamon and mix well
- 3
Add egg white, butter, and vanilla extract and stir until uniform, whisking with a fork if needed
- 4
Microwave for 1 1/2 minutes or until set
- 5
Immediately run a knife along the edges to help separate the cake from the mug
- 6
Gently shake mug to release and transfer cake to a plate
- 7
Let cool completely for about 15 minutes
- 8
Slice cake in half horizontally
- 9
Top the bottom slice with whipped topping followed by the remaining cake slice
Tips
Use a wide-bottomed mug to ensure even cooking and easier removal of the finished cake.
Let the cake cool completely before slicing to prevent the whipped topping from melting.
Run a knife around the edges immediately after microwaving to prevent sticking.
Good to Know
Store covered in refrigerator for up to 2 days. Best served fresh.
Can be made up to 1 day ahead. Store cake and topping separately, assemble before serving.
Serve immediately after assembly for best texture. Can be served at room temperature or chilled.
Common Mistakes
Don't skip the cooling step or the whipped topping will melt
Use nonstick spray to prevent sticking in the mug
Don't overmix the batter to avoid a tough cake
Substitutions
Works equally well
Increases calories and carbs
Increases calories and fat
FAQ
Can I use regular sugar instead of the substitute?
Yes, you can substitute regular brown sugar 1:1 for the Swerve, but this will increase the calories and carbohydrates significantly.
What if I don't have a wide-bottomed mug?
A regular mug works but may cook unevenly. Reduce microwave time slightly and check for doneness to avoid overcooking the edges.
How long will this keep in the refrigerator?
The assembled cake will keep for up to 2 days covered in the refrigerator, though it's best eaten fresh for optimal texture.