Deliciously Easy Simple Cake In A Cup Recipe Everyone Will Love

Why You’ll Love This Recipe

I like this recipe because it’s simple, versatile, and looks so pretty when assembled. It’s the kind of dessert that instantly brightens a table and can be tailored to any occasion. The boxed cake mix keeps things easy, while the homemade buttercream frosting adds that rich, bakery-style flavor. I also love how these cake cups store well and are perfectly portioned for sharing.

Ingredients

(Note: All ingredient amounts are listed in the recipe card below.)

For the Cake:
1 box white cake mix (15.25 oz)
1 cup water
1/2 cup vegetable oil
3 large eggs
1/4 cup rainbow sprinkles (optional)

For the Vanilla Buttercream Frosting:
1 cup unsalted butter, softened
4 cups powdered sugar
1 tablespoon vanilla extract
1–2 tablespoons milk or heavy cream

Optional Toppings:
Extra rainbow sprinkles
Mini candies or cookies
Colorful whipped cream

Directions

Prepare the Cake Batter
I preheat my oven to 350°F (175°C) and grease a 9×13-inch baking pan. In a large bowl, I combine the cake mix, water, oil, and eggs. I beat the mixture for about 2 minutes until it’s smooth and fluffy, then gently fold in sprinkles if I’m adding them.

Bake the Cake
I pour the batter into the prepared pan and bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean. Once baked, I let the cake cool completely on a wire rack.

Make the Frosting
While the cake cools, I beat softened butter until creamy. I gradually add powdered sugar, mixing well after each addition. Then I add vanilla extract and just enough milk or cream to get a smooth, spreadable texture. I beat it until the frosting is light, fluffy, and perfect for layering.

Assemble the Dessert Cups
Once the cake is cool, I cut it into cubes or use a round cutter to fit the cups. I start layering cake and frosting alternately in mason jars or dessert cups until they’re full. I like to finish each cup with a swirl of frosting and a handful of sprinkles or mini candies.

Chill Before Serving
I refrigerate the cups for at least 30 minutes before serving to let the frosting set and the flavors blend beautifully.

Servings and Timing

This recipe makes about 10–12 dessert cups. It takes 20 minutes to prepare, 30 minutes to bake, and about 50 minutes total, plus chilling time.

Variations

I enjoy switching up the flavors for different occasions. Sometimes I make chocolate cake with mint frosting for a rich twist, red velvet with cream cheese frosting for a classic pairing, or lemon cake with blueberry filling for something fruity and fresh. I also like tinting the frosting with food coloring to match the theme of a party or holiday.

Storage/Reheating

I keep the cake cups covered in the refrigerator for up to 4 days. They taste best slightly chilled. I don’t recommend freezing them once assembled, but the cake and frosting can each be frozen separately for up to 2 months.

FAQs

Can I use homemade cake instead of boxed mix?

Yes, I often use my favorite vanilla or funfetti cake recipe for a more homemade touch.

Can I make these cups ahead of time?

Yes, I assemble them the day before and keep them chilled until serving.

What size cups work best?

I like using 4–6 oz clear plastic or glass cups so the layers show beautifully.

How can I make this recipe dairy-free?

I use dairy-free butter and milk alternatives for the frosting, and a dairy-free cake mix.

Can I use different frosting flavors?

Absolutely! I sometimes use chocolate, cream cheese, or strawberry frosting depending on the cake flavor.

How can I make cleaner layers?

I use a piping bag for the frosting — it creates neat, even layers with less mess.

Can I use cupcakes instead of a cake base?

Yes, I crumble baked cupcakes into the cups if I already have some on hand.

What’s the best way to decorate these cups?

I like topping them with whipped cream, colorful sprinkles, or a mini cookie for a cute finishing touch.

Can I make them gluten-free?

Yes, I use a gluten-free cake mix and check that all other ingredients are gluten-free.

How long should I chill them before serving?

At least 30 minutes, but I sometimes chill them for an hour to let the frosting firm up nicely.

Conclusion

This simple cake in a cup recipe is one of my go-to desserts when I want something easy, colorful, and guaranteed to please everyone. The soft cake layers and creamy frosting come together in a charming presentation that’s as fun to look at as it is to eat. I love how customizable it is, making it perfect for any celebration or sweet craving.