Rat Cake Birthday Sheet Bake

Featured in: Quick Celebration Dishes

This whimsical birthday sheet cake features a moist vanilla sponge layered with creamy buttercream frosting. Its playful design draws inspiration from mischievous mice, using colored frosting, candy, and fondant to craft charming rat decorations on top. The process involves baking a classic American-style sheet cake, coloring and piping the buttercream to form ears, noses, and tails, then adding sprinkles or edible glitter for extra fun. Easy to prepare, it serves a crowd and ensures delight for kids and adults alike, making it ideal for celebrations where creativity and sweet flavors shine.

Updated on Thu, 30 Oct 2025 08:51:00 GMT
Moist Rat Cake Birthday Sheet Bake topped with playful buttercream mice decorations.  Save Pin
Moist Rat Cake Birthday Sheet Bake topped with playful buttercream mice decorations. | fabulousdishesby.com

This Rat Cake Birthday Sheet Bake is the perfect centerpiece for any birthday celebration, combining classic vanilla sponge with whimsical buttercream rats and playful decorations for a treat that tickles both taste buds and imagination.

I first baked this cake for my nephew's birthday, and watching everyone laugh and marvel at the adorable rat decorations made it an unforgettable party centerpiece.

Ingredients

  • Cake: 2 1/2 cups (315 g) all-purpose flour, 2 1/2 tsp baking powder, 1/2 tsp salt, 1 cup (225 g) unsalted butter (room temperature), 1 3/4 cups (350 g) granulated sugar, 4 large eggs (room temperature), 1 tbsp pure vanilla extract, 1 cup (240 ml) whole milk
  • Buttercream Frosting: 1 cup (225 g) unsalted butter (room temperature), 4 cups (480 g) powdered sugar (sifted), 2 3 tbsp whole milk, 1 1/2 tsp vanilla extract, Pinch of salt, Food coloring (gray, pink, black gel or liquid)
  • Decorations: Candy eyes or mini chocolate chips, Pink candy melts or fondant (for ears and noses), Licorice laces or black fondant (for tails and whiskers), Edible glitter or sprinkles (optional)

Instructions

Prepare the Pan:
Preheat oven to 350°F (175°C). Grease and line a 9x13-inch (23x33 cm) sheet cake pan with parchment paper.
Mix Dry Ingredients:
In a medium bowl, whisk together flour, baking powder, and salt.
Cream Butter and Sugar:
In a large bowl, cream together butter and sugar until light and fluffy (about 3 4 minutes).
Add Eggs and Vanilla:
Beat in eggs, one at a time, then mix in vanilla extract.
Combine Wet and Dry:
Alternately add the flour mixture and milk to the creamed mixture, beginning and ending with flour. Mix until just combined; do not overmix.
Bake:
Pour batter into prepared pan and smooth the surface. Bake for 28 32 minutes, or until a toothpick inserted into the center comes out clean.
Cool:
Cool cake in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Make Frosting:
Beat butter until creamy. Gradually add powdered sugar, mixing on low. Add milk, vanilla, and salt; beat until fluffy. Divide frosting into portions and tint gray, pink, and black as desired.
Decorate:
Spread a smooth layer of gray buttercream over the cooled cake. Use piping bags fitted with round tips to pipe small "rat" shapes on top of the cake using gray frosting. Add pink frosting for ears and noses, and black frosting for eyes or use candy eyes. Add licorice laces for tails and whiskers.
Finish:
Decorate with edible glitter or sprinkles if desired. Slice and serve for a memorable birthday treat.
Delightful Rat Cake Birthday Sheet Bake, featuring vibrant frosting and whimsical candy accents.  Save Pin
Delightful Rat Cake Birthday Sheet Bake, featuring vibrant frosting and whimsical candy accents. | fabulousdishesby.com

When my family gathers for birthday parties, this rat cake always brings smiles and kicks off playful conversations around the table.

Required Tools

9x13-inch (23x33 cm) sheet cake pan, electric mixer, mixing bowls, offset spatula, piping bags and tips, wire rack, parchment paper

Notes

Substitute chocolate cake for a richer flavor. Use fondant for more detailed rat decorations. Store leftovers in an airtight container at room temperature for up to 2 days. Pair with a glass of milk or a light dessert wine.

Nutritional Information

Calories: 465, Total Fat: 22 g, Carbohydrates: 64 g, Protein: 4 g (per serving)

Charming Rat Cake Birthday Sheet Bake, perfect for festive celebrations with creamy frosting art. Save Pin
Charming Rat Cake Birthday Sheet Bake, perfect for festive celebrations with creamy frosting art. | fabulousdishesby.com

Enjoy creating and sharing this whimsical rat-themed cake—it is sure to be the highlight of your next celebration!

Recipe FAQs

Can I make this cake ahead of time?

Yes, prepare the cake a day in advance and store covered at room temperature for up to two days to maintain freshness.

How do I achieve vibrant colors in the frosting?

Use gel food coloring for strong shades; mix gradually until your desired hues for rats, ears, and noses are reached.

What can I use for decorating rats if I lack fondant?

Mini chocolate chips, candy melts, licorice laces, and colored buttercream are great alternatives for creative details.

Can I substitute the cake flavor?

Chocolate, lemon, or other favorite sponge flavors work well; adjust ingredients and baking time if needed.

Is the cake suitable for vegetarians?

Yes, all ingredients listed—including cake and frosting—are vegetarian-friendly; check candy for additional additives.

What tools are essential for decorating rats?

Piping bags with round tips, offset spatula, and small candies or fondant shapes are key for adding whimsical touches.

Rat Cake Birthday Sheet Bake

Moist vanilla sheet cake with buttercream and whimsical rat-themed decorations for a fun, festive birthday celebration.

Prep Duration
25 min
Time to cook
30 min
Overall duration
55 min
Posted by Fabulous dishes by Vanessa Collins


Skill level Easy

Cuisine style American

Servings made 12 Number of servings

Dietary details Vegetarian-friendly

Ingredient list

Cake

01 2 1/2 cups all-purpose flour
02 2 1/2 teaspoons baking powder
03 1/2 teaspoon salt
04 1 cup unsalted butter, room temperature
05 1 3/4 cups granulated sugar
06 4 large eggs, room temperature
07 1 tablespoon pure vanilla extract
08 1 cup whole milk

Buttercream Frosting

01 1 cup unsalted butter, room temperature
02 4 cups powdered sugar, sifted
03 2 to 3 tablespoons whole milk
04 1 1/2 teaspoons vanilla extract
05 Pinch of salt
06 Food coloring (gray, pink, and black gel or liquid)

Decorations

01 Candy eyes or mini chocolate chips
02 Pink candy melts or fondant for ears and noses
03 Licorice laces or black fondant for tails and whiskers
04 Edible glitter or sprinkles (optional)

Step-by-Step Guide

Instruction 01

Prepare Baking Pan: Preheat oven to 350°F. Grease and line a 9x13-inch sheet pan with parchment paper.

Instruction 02

Mix Dry Ingredients: Whisk together the flour, baking powder, and salt in a medium mixing bowl.

Instruction 03

Cream Butter and Sugar: In a large bowl, beat butter and granulated sugar with an electric mixer until light and fluffy, approximately 3 to 4 minutes.

Instruction 04

Add Eggs and Vanilla: Incorporate eggs one at a time, mixing well after each addition, then blend in vanilla extract.

Instruction 05

Combine Dry Ingredients and Milk: Alternately add the flour mixture and milk to the creamed mixture, starting and ending with flour. Mix only until incorporated.

Instruction 06

Bake Sponge: Transfer the batter to the prepared pan and smooth the top. Bake for 28 to 32 minutes, or until a toothpick inserted in the center exits clean.

Instruction 07

Cool Sponge: Let the cake rest in the pan for 10 minutes, then move to a wire rack to cool completely.

Instruction 08

Prepare Buttercream: Beat butter for the frosting until creamy. Gradually incorporate powdered sugar at low speed. Add milk, vanilla, and salt, and beat until fluffy. Divide into portions, tinting with food colorings as desired.

Instruction 09

Apply Base Layer: Spread a smooth layer of gray-tinted buttercream over the fully cooled cake.

Instruction 10

Create Rat Decorations: Using piping bags fitted with round tips, pipe small rat shapes with gray frosting. Add pink frosting or fondant for ears and noses. Use black frosting or candy eyes for facial details. Add licorice laces for tails and whiskers.

Instruction 11

Add Finishing Touches: Decorate surface with edible glitter or sprinkles as desired.

Instruction 12

Slice and Serve: Cut into portions and serve for a festive birthday presentation.

Equipment needed

  • 9x13-inch sheet cake pan
  • Electric mixer
  • Mixing bowls
  • Offset spatula
  • Piping bags and tips
  • Wire rack
  • Parchment paper

Allergy details

Take a moment to check each ingredient for possible allergens. Always reach out to a medical expert if you're unsure.
  • Contains wheat (gluten), eggs, and dairy (milk, butter). Decorations may contain soy or other allergens. Verify all ingredients are nut-free if serving to individuals with nut allergies.

Nutrition details by serving

These details help guide you, but be sure to consult a healthcare professional when needed.
  • Kcal: 465
  • Lipids: 22 g
  • Carbohydrates: 64 g
  • Protein: 4 g