Stranger Things Birthday Cake with Christmas Lights

This chocolate layer cake looks like it rode straight out of Hawkins on a BMX. A rich, tender crumb gets wrapped in bright red vanilla buttercream, then dotted with strings of yellow “lights” that mirror the show’s most famous prop.

It’s a real deal birthday cake, not just a novelty. The chocolate is deep and fudgy, the buttercream is creamy and not too sweet, and the whole thing comes together without any specialty pans or sculpting.

What Makes This Cake So Fun

There is a moment when you step back and see those little yellow dots strung across the red frosting. That is the moment. The design is simple enough that a first-timer can pull it off, but the result looks like it took all day.

The chocolate cake itself stays moist for days because of the oil and buttermilk. The red frosting gets its color from gel food coloring, which keeps the buttercream stable and doesn’t thin it out the way liquid coloring does.

Ingredients

• For the Chocolate Cake
• 1¾ cups all-purpose flour: spooned and leveled, never scooped
• ¾ cup unsweetened cocoa powder: Dutch-process gives the deepest flavor
• 2 cups granulated sugar
• 1½ tsp baking powder
• 1½ tsp baking soda
• 1 tsp fine sea salt
• 2 large eggs, at room temperature
• 1 cup buttermilk, at room temperature
• ½ cup vegetable oil: keeps the cake moist
• 2 tsp vanilla extract
• 1 cup hot brewed coffee: brings out the chocolate, you won’t taste it

• For the Red Vanilla Buttercream
• 2 cups unsalted butter, softened to room temperature
• 6 cups powdered sugar, sifted
• ¼ cup heavy cream or whole milk
• 2 tsp vanilla extract
• Red gel food coloring: use a brand that gives true red, like Americolor or Chefmaster
• Pinch of salt

• For the Christmas Lights and Letters
• Yellow candy melts or yellow frosting in a piping bag
• Black writing icing or melted dark chocolate in a piping bag
• Small round tip (Wilton #3 or similar) for lights
• A printed stencil of the alphabet wall or freehand letters for the border

Variations / Substitutions

• Swap the chocolate cake: a vanilla or funfetti layer cake works just as well, keep the red frosting for the same effect.
• Make it dairy-free: use plant-based butter and milk in the cake and buttercream; the texture stays close.
• Use store-bought frosting: buy vanilla buttercream and tint it red with gel coloring; the candy lights still pop.
• Skip the coffee: replace with hot water; the chocolate flavor will be a little less intense.

If you want a simpler chocolate dessert that still feels from the 80s, try my Chocolate Pudding Pops.

How to Make Stranger Things Birthday Cake with Christmas Lights

Step 1: Mix the Chocolate Cake Batter

Preheat the oven to 350°F (175°C) and grease two 9-inch round cake pans, then line the bottoms with parchment. In a large bowl, whisk together the 1¾ cups flour, ¾ cup cocoa powder, 2 cups sugar, baking powder, baking soda, and salt until there are no lumps.

Pour in the eggs, buttermilk, oil, and vanilla, then beat on medium speed for 2 minutes. The batter will look glossy and smooth. Scrape down the sides, then slowly stream in the hot coffee while mixing on low. The mix will be thin, like a crepe batter. That thins it out, but it rises into a tender crumb.

This step matters because the hot liquid blooms the cocoa and really rounds out the chocolate flavor. If the batter separates a little, don’t worry. It comes together in the oven.

Step 2: Bake the Cake Layers

Divide the batter evenly between the two prepared pans. Tap each pan gently on the counter to release air bubbles. Bake for 28 to 32 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.

The tops will spring back when you press them lightly, and the edges will start to pull away from the sides of the pan. Let the layers cool in the pans for 10 minutes, then turn them out onto wire racks and cool completely, about 2 hours.

Warm cakes will melt the buttercream, so be patient here. You can even bake the layers a day ahead, wrap them well, and store them at room temperature.

Step 3: Whip the Red Buttercream

In a stand mixer with the paddle attachment, beat the 2 cups of softened butter on medium speed for about 4 minutes, until it’s pale and fluffy. Stop once halfway through to scrape the bowl.

Turn the mixer to low and gradually add the 6 cups of powdered sugar, 1 cup at a time. Pour in the heavy cream, vanilla, and salt, then increase the speed to medium and beat for another 2 minutes. Now add the red gel coloring a little at a time until you get a true, bright red. Beat for an extra minute to distribute the color evenly.

The buttercream should be smooth and spreadable, not stiff. If it feels too thick, add a tablespoon more cream. If you want a deeper red, let the frosting sit for 10 minutes after tinting; the color deepens as it rests.

Step 4: Fill and Frost the Cake

Place one cooled cake layer on a serving plate or cake board. Scoop about 1 cup of red buttercream on top and spread it to the edge with an offset spatula. Put the second layer on top, flat side up. Spread a very thin layer of frosting over the entire cake, just enough to seal in crumbs. Pop the cake in the refrigerator for 20 minutes to set that crumb coat.

Once the crumb coat is firm to the touch, use the remaining buttercream to frost the top and sides. Smooth it with a bench scraper, turning the turntable as you go. The surface doesn’t need to be perfect because the lights will draw the eye anyway.

Step 5: Pipe the Lights and Add the Letters

Melt the yellow candy melts according to the package directions and transfer them to a piping bag fitted with a small round tip. Pipe thin, slightly curved strings across the top and down the sides of the cake, spacing them about an inch apart. Then pipe small dots of yellow along each string, like glowing bulbs.

While the yellow dots set, use the black writing icing to pipe letters in a jagged, playful font around the side of the cake or along the bottom border. Think “A B C” in the style of Joyce’s wall. Serve the cake at room temperature, and watch your guests stare at it for a full minute before cutting in.

Getting the Lights Just Right

• Chill the cake for 10 minutes after the final coat of red frosting. Candy melts stick better to a firm surface.
• If you don’t have candy melts, tint a few spoonfuls of the red buttercream bright yellow and pipe the dots that way. The texture will be a bit softer but still reads as lights.
• Print a small section of the alphabet wall from the show and place it under parchment paper to practice your letter piping before going straight onto the cake.
• The black letters don’t need to spell anything; a few random letters stacked on top of each other look more like the actual prop.

Bake times by pan size:

Keeping Your Cake Fresh

• Refrigerate: Store the frosted cake in an airtight carrier or under a cake dome in the fridge for up to 4 days. The buttercream forms a tight seal, so the cake stays moist.
• Serve at room temperature: Pull the cake out of the fridge about 45 minutes before serving. Cold buttercream feels dense and grainy, so letting it soften brings back the creamy texture.

Frequently Asked Questions

Can I use a boxed cake mix instead of making the batter from scratch?

Yes. Prepare two 9-inch rounds from a devil’s food or chocolate mix and follow the same red buttercream and decoration steps.

What if my buttercream turns out pink instead of red?

Red gel color can look pinkish at first. Let the frosting sit for 15 minutes after mixing; the color deepens. If it still needs more, add a tiny drop of black or cocoa powder to darken it without changing the texture.

How do I transport this cake without smudging the lights?

Chill the well-frosted cake for at least 1 hour before transporting. The firm shell of buttercream holds the candy lights in place. Insert a few toothpicks into the side as placeholders, then remove them just before presenting.

Can I make the buttercream less sweet?

You can. Reduce the powdered sugar to 4 cups and add ¼ teaspoon of fine salt. The buttercream will be slightly softer, so keep the cake cool.

Stranger Things Birthday Cake Recipe

Print Recipe Pin Recipe

Prep Time 40 minutes mins

Cook Time 30 minutes mins

Total Time 1 hour hr 10 minutes mins

Servings: 12 servings

Calories: 520

Ingredients Method Notes

Ingredients

  

• 1¾ cups all-purpose flour
• ¾ cup unsweetened cocoa powder
• 2 cups granulated sugar
• 1½ tsp baking powder
• 1½ tsp baking soda
• 1 tsp fine sea salt
• 2 large eggs, at room temperature
• 1 cup buttermilk, at room temperature
• ½ cup vegetable oil
• 2 tsp vanilla extract
• 1 cup hot brewed coffee
• 2 cups unsalted butter, softened
• 6 cups powdered sugar, sifted
• ¼ cup heavy cream or whole milk
• Red gel food coloring
• Yellow candy melts, for piping lights
• Black writing icing, for letters

Method

 

1. Preheat oven to 350°F (175°C). Grease two 9-inch round pans and line bottoms with parchment. Whisk flour, cocoa, sugar, baking powder, baking soda, and salt. Add eggs, buttermilk, oil, and vanilla; beat 2 minutes. Mix in hot coffee on low until just combined.
2. Divide batter into pans, tap to release bubbles. Bake 28-32 minutes until a toothpick comes out with moist crumbs. Cool in pans 10 minutes, then turn out and cool completely.
3. Beat butter 4 minutes until fluffy. Gradually add powdered sugar, then cream, vanilla, and salt. Beat 2 minutes, then tint with red gel coloring until bright red.
4. Place one cake layer on a plate, spread 1 cup frosting, top with second layer. Apply a thin crumb coat, chill 20 minutes, then frost the entire cake red.
5. Melt yellow candy melts, pipe curved strings and small dots for lights. Use black icing to pipe letters along the sides. Serve at room temperature.

Notes

The cake layers can be baked a day ahead and wrapped well. Cool them fully before frosting, and give the finished cake at least 30 minutes to come to room temperature after chilling if you store it in the fridge.