Simple Bento Cake DIY | Easy Mini Cake Decorating Idea for Beginners
Beginner-friendly mini bento cake with simple vanilla layers and easy buttercream, perfect for gifting and quick decorating. Uses basic tools and makes neat, palm-sized cakes.
Ingredients
Ingredients
- 1 cup (120 g) all-purpose flour
- 3/4 cup (150 g) granulated sugar
- 1 1/4 tsp baking powder
- 1/4 tsp fine salt
- 1/2 cup (120 ml) milk, room temperature
- 1/4 cup (60 ml) neutral oil (vegetable or canola)
- 1 large egg, room temperature
- 1 1/2 tsp vanilla extract
- 2 tbsp sour cream or plain yogurt
- 1/2 cup (113 g) unsalted butter, softened
- 1 3/4–2 cups (210–240 g) powdered sugar
- 1–2 tbsp milk or heavy cream
- 1 tsp vanilla extract
- Pinch of salt
- Gel food coloring (optional)
Instructions
Instructions
- Heat oven to 350°F (175°C), line a quarter sheet or 8-inch square pan with parchment, and lightly grease.
- Whisk together flour, sugar, baking powder, and salt in a bowl.
- In another bowl whisk milk, oil, egg, vanilla, and sour cream until smooth.
- Combine wet and dry ingredients and stir just until no flour streaks remain.
- Spread batter in a thin even 1/2-inch layer in the pan and smooth the top.
- Bake 12–15 minutes until the top springs back and a toothpick comes out clean.
- Cool in the pan 10 minutes, then transfer to a rack to cool completely.
- Beat softened butter on medium-high for 2 minutes until pale and creamy.
- Sift in powdered sugar, add salt and vanilla, and beat on low to combine.
- Add milk or cream a little at a time until the buttercream is smooth and spreadable, then tint with gel colors if desired.
- Use a 3–4 inch round cutter to punch out 2 or 3 cake rounds per mini cake, saving scraps for cake pops.
- Place one round on parchment, add a thin layer of buttercream (and optional jam), and top with another round to make 2 or 3 layers.
- Apply a very thin crumb coat of buttercream over the cake and chill 10–15 minutes until firm.
- Add a thicker final coat, smooth the sides and top, and neaten the edges by pulling frosting inward.
- Pipe a simple border and add small decorations or a short message, then chill about 10 minutes to set before boxing.
Notes
Batter yields enough for 2–3 mini cakes depending on cutter size. For variations, try jam between layers, cocoa in the batter, crushed cookies in the filling, lemon zest, sprinkles, or matcha in the buttercream. Store covered in the fridge up to 3 days; freeze undecorated layers up to 2 months or decorated cakes up to 1 month. Avoid heat as buttercream softens quickly.