Cinnamoroll Bento Cake (No Fondant, No Fuss)
This Cinnamoroll bento cake is a tiny vanilla cake decorated to look like the sweet Sanrio puppy, and you can make it entirely with buttercream—no fondant, no special cutters.
It bakes in a single 9×5-inch loaf pan, then you cut the layers, stack them, and decorate with a couple of basic piping tips. If you’ve been wanting to try a character cake but assumed it would be complicated, this one is a gentle start.
Why This Bento Cake Is So Doable
The vanilla cake is a scaled-down version of a classic buttermilk cake—soft, light, and fine-crumbed, without being fragile. It bakes in a loaf pan so you don’t need any special cake pans.
The real win is how simple the decoration is. You pipe the whole Cinnamoroll face with buttercream using two basic piping tips. No sculpting, no rolling. If you can pipe a circle, you can make this cake. I’ll walk you through it step by step.
Ingredients
- 1 cup (125g) all-purpose flour: spooned and leveled to avoid a dense cake
- 1/2 cup (100g) granulated sugar
- 1 tsp baking powder
- 1/4 tsp fine sea salt
- 1/2 cup (120ml) buttermilk: at room temperature; see the substitution note below
- 1 large egg: at room temperature
- 1/4 cup (60ml) vegetable oil: use a neutral oil like canola
- 1 tsp vanilla extract
- 1/2 cup (113g) unsalted butter, softened: for the buttercream
- 1 1/2 cups (180g) powdered sugar: sift if it has lumps
- 1-2 tbsp heavy cream or whole milk
- 1/2 tsp vanilla extract: for the frosting
- Pinch salt
- Pink gel food coloring: for the cheeks
- Black gel food coloring: for eyes and mouth; or mix dark cocoa powder with a drop of water
Variations / Substitutions
- Buttermilk substitute: Replace with 1/2 cup milk mixed with 1/2 tsp white vinegar or lemon juice; let it sit for 5 minutes.
- Oil swap: Melted coconut oil (cooled to room temperature) works, though it adds a light coconut note.
- Dairy-free: Use oat milk soured with lemon juice and a vegan butter stick for the buttercream. The cake will still be tender.
- Chocolate version: Add 2 tbsp unsweetened cocoa powder and reduce the flour by 2 tbsp for a chocolate base—pair it with bright white frosting for contrast.
- Other characters: Use the same method for My Melody (swap pink for the body), Hello Kitty (add a bow), or any round-faced critter.
Pumpkin Spice Bundt Cake is next on our list if this cake is your kind of dessert.
How to Make Cinnamoroll Bento Cake
Step 1: Bake the Cake
Preheat your oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line it with parchment paper so the cake lifts out easily. In a medium bowl, whisk together the 1 cup flour, 1/2 cup sugar, 1 tsp baking powder, and 1/4 tsp salt. In a separate bowl, whisk the 1/2 cup buttermilk, 1 large egg, 1/4 cup oil, and 1 tsp vanilla until smooth. Pour the wet ingredients into the dry and stir just until no dry streaks remain—a few small lumps are fine.
The batter will be thin and pale yellow. Pour it into the prepared pan and bake for 22 to 25 minutes. The cake is ready when the top springs back lightly and a toothpick inserted in the center comes out clean. Let it cool in the pan for 10 minutes, then lift it out by the parchment and cool completely on a rack.
Step 2: Mix the Buttercream
Beat the 1/2 cup softened butter with an electric mixer for 2 to 3 minutes until it looks pale and creamy. With the mixer on low, gradually add the 1 1/2 cups powdered sugar. Once incorporated, pour in 1 tbsp of cream, 1/2 tsp vanilla, and a pinch of salt. Increase the speed to medium and beat for another 2 minutes until the buttercream is light and fluffy.
Taste and adjust the vanilla or salt if you like. The buttercream should spread easily but hold its shape—if it feels too stiff, drizzle in a tiny bit more cream. Keep most of it white, then scoop out a couple of spoonfuls and color one soft pink and one black, using the gel food colorings a little at a time.
Step 3: Level and Fill the Cake
Make sure the cake is completely cool before you start. Use a long serrated knife to slice off any domed top so the surface is flat—removing about a 1/4 inch usually does it. Then cut the cake horizontally into two even layers. Spread a thin, even layer of the white buttercream on the bottom layer, all the way to the edges.
Place the second layer on top, cut-side down, so you have a flat upper surface. Press down gently so the layers stick together, then pop the cake into the fridge for 10 minutes. This quick chill keeps the layers from sliding when you apply the crumb coat.
Step 4: Frost the Cake Smooth
Apply a thin layer of white buttercream over the top and sides of the cake—crumbs showing through is normal at this stage, it’s just the crumb coat. Chill the cake for 15 minutes until the frosting feels firm to the touch.
Once set, mound on a thicker layer of buttercream and smooth it with an offset spatula and a straight bench scraper. Aim for a clean, boxy shape that will be your blank canvas. If the frosting starts to get soft or greasy, put the cake back in the fridge for 5 minutes and then keep going.
Step 5: Pipe the Cinnamoroll Face
Transfer the black and pink buttercream to piping bags fitted with small round tips (a Wilton #2 or #3 works well). Pipe two small almond-shaped eyes with the black, a tiny horizontal line for the mouth, and two round pink dots on each side for the cheeks. Keep a little white buttercream aside if you want to add the curly tail—pipe a small C shape on a piece of parchment paper, freeze it for 5 minutes, then peel it off and place it on the side of the cake.
The face doesn’t need to be perfect; a slightly crooked little dog is part of the charm. Serve the cake right away, or set it in a cool spot until you’re ready to slice.
A Few Notes for the Cutest Bento Cake
- Bring all the cold ingredients (egg, buttermilk, butter) to room temperature before starting. This helps the cake bake evenly and stops the buttercream from splitting.
- A small rotating cake turntable makes smoothing the sides much easier, but you can also set the cake on an upside-down bowl as a work surface.
- If your kitchen is warm, keep the buttercream bowl chilled between steps. The frosting should be spreadable, not shiny or greasy.
- For the black details, you can avoid gel coloring altogether by mixing a little dark unsweetened cocoa powder with a drop of water to form a paste, then pipe that.
Storing Leftovers
- Refrigerate: Keep the cake in an airtight container for up to 3 days. The buttercream sets up nicely when chilled.
- Serve cold: This cake tastes lovely straight from the fridge, with a cool, fudgy frosting texture.
Frequently Asked Questions
Can I make the cake layers ahead of time?
Yes. Bake the cake, let it cool, wrap it tightly, and keep it at room temperature overnight. Frost and decorate the next day.
My buttercream turned out too soft. How do I fix it?
Chill the bowl and beaters for 10 minutes, then re-whip the buttercream. If it’s still loose, add a tablespoon of powdered sugar at a time until it firms up.
Can I use liquid food coloring instead of gel?
You can, but use it sparingly. Liquid coloring can thin the buttercream, so start with one tiny drop and add more slowly.
What if I don’t have a bench scraper to smooth the frosting?
Use a clean, straight metal ruler or the side of a tall, flat knife. A bench scraper is helpful but not essential.
How do I get the Cinnamoroll face even if my hands are shaky?
Print a small template of the face, place it under a sheet of parchment paper, and pipe the features onto the parchment. Freeze the piped design briefly, then peel it off and place it on the cake.
Cinnamoroll Bento Cake Recipe
Ingredients
Method
- Preheat oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line with parchment. Whisk the flour, sugar, baking powder, and salt. In a separate bowl, whisk the buttermilk, egg, oil, and 1 tsp vanilla. Combine wet and dry ingredients, stir until just smooth, and pour into the pan. Bake 22-25 minutes until a toothpick comes out clean. Cool completely.
- Beat the softened butter until creamy. Gradually add the powdered sugar, then 1 tbsp cream, 1/2 tsp vanilla, and salt. Beat for 2 minutes until fluffy. Keep most of the buttercream white, and color small portions pink and black.
- Level the cooled cake by slicing off the dome. Cut it horizontally into two even layers. Spread white buttercream on the bottom layer, set the second layer on top cut-side down, and gently press. Chill for 10 minutes.
- Apply a thin crumb coat of white buttercream over the whole cake; chill for 15 minutes. Add a final thicker coat and smooth the sides and top with a bench scraper.
- Using small round piping tips, pipe black eyes, pink cheeks, and a tiny mouth. For the tail, pipe a white C shape on parchment, freeze for 5 minutes, peel off, and place on the cake. Serve.
Notes
