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Anytime you’re craving something sweet but don’t want the fuss—or the cleanup—of baking a whole cake, this 2-ingredient Funfetti mug cake is here to save the day.
Made with cake mix and a splash of zero-calorie soda, this quick microwave (affiliate link) dessert comes together in minutes using simple pantry staples. No eggs, no oil, no oven required.
This lightened-up single-serving treat is perfect for portion control and satisfying your sweet tooth without going overboard. The soda replaces the traditional ingredients, creating a surprisingly fluffy, tender mini cake with those nostalgic rainbow sprinkles in every bite.
Whether you need a last-minute dessert, an afternoon pick-me-up, or a cozy late-night treat, this easy mug cake delivers every time. Just mix, microwave (affiliate link), and enjoy.
Table of Contents
Why I Love This 2-Ingredient Mug Cake
- It’s almost impossible to mess up
- Ready in about 2 minutes start to finish
- No eggs or oil needed (magic!)
- Perfect for portion control
- WW-friendly and easy to track
- Uses simple pantry ingredients
Ingredients and Substitutions
- Funfetti or Rainbow Chip Cake Mix – Any boxed Funfetti-style mix works here. I used Betty Crocker Super Moist Party Rainbow Chip, but store brands work just as well. Zero-Calorie Lemon-Lime Soda – Sprite Zero or 7UP Zero Sugar are perfect. The carbonation helps create a light, fluffy texture without eggs or oil.
Calories and WW Points
According to my calculations, this single serve mug cake has just 120 calories.
To see your WW Points for this recipe, track it in the WW App!
(You must be logged into WW on a smartphone or tablet.)
How to Make Rainbow Mug Cake, Step-by-Step
Step 1: Gather and prepare all ingredients.
Step 2: Lightly spray a microwave-safe mug with nonstick spray.
Step 3: Add the cake mix and soda and mix well. (Alternatively, to ensure thorough mixing of ingredients, first stir together the cake mix and soda in a small bowl (affiliate link) and then spoon into the prepared mug.)
Step 4: Microwave on HIGH for 1-minute, or until set.
Step 5: Cake can be enjoyed directly from the mug, or removed to a small plate. Garnish with a dollop of light whipped topping and sprinkles, if desired.
Substitutions and Variations
- Swap in any flavor of cake mix you love—chocolate, yellow, spice, or lemon all work beautifully
- Try different zero-calorie sodas like cherry, tropical, or orange for a fun twist
- Flavored sparkling water can work in a pinch, though the texture may be slightly less rich
- Top with light whipped topping, a dusting of powdered sugar, or fresh fruit
Tips for the Best Mug Cake
- Don’t overmix—just stir until combined
- Microwave times may vary slightly depending on your microwave
- The cake will rise as it cooks—use a larger mug to avoid overflow
- Let it sit for a minute after cooking to finish setting
If you’ve made this single-serving Funfetti Rainbow Microwave Mug Cake, please give the recipe a star rating below and leave a comment letting me know how you liked it. And stay in touch on Pinterest, Facebook, Instagram and Twitter for the latest updates.
2-Ingredient Funfetti Mug Cake (WW-Friendly)
Equipment
Ingredients
- 1/4 cup Funfetti/Rainbow cake mix
- 1 tablespoons zero calorie lemon lime soda
Instructions
- Gather and prepare all ingredients. Lightly spray a microwave-safe mug with nonstick spray.
- Add the cake mix and soda and mix well. (Alternatively, to ensure thorough mixing of ingredients, first stir together the cake mix and soda in a small bowl (affiliate link) and then spoon into the prepared mug.)
- Microwave on HIGH for 1-minute, or until set.
- Cake can be enjoyed directly from the mug, or removed to a small plate. Garnish with a dollop of light whipped topping and sprinkles, if desired.
Notes
(Must be logged into WW on a smartphone or tablet.) 3 PointsPlus (Old plan)
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Source: Hungry Girl Fast & Easy Cookbook (affiliate link)
Frequently Asked Questions
Can I make this mug cake without soda?
The soda is key for replacing eggs and oil, but you can experiment with sparkling water, which I have done with good success.
Why is my mug cake rubbery?
It was likely overcooked. Try reducing the microwave time by 5–10 seconds.
Can I make this ahead of time?
This is best enjoyed fresh, but you can mix the batter ahead and microwave when ready.
What size mug should I use?
Use a standard 10–12 oz microwave-safe mug to allow room for rising.
