On Harry Potter’s very first ride on the Hogwarts Express, Ron Weasley’s mother had packed him sandwiches — but Harry had a pocket full of gold and a trolley full of options, and Cauldron Cakes were among the treats he chose. These Harry Potter Cauldron Cakes are individual devil’s food cakes baked directly in silicone cauldron molds, filled with a hidden pocket of chocolate syrup, and finished with swirled red and yellow buttercream that looks like something actively bubbling over the rim. They’re an intermediate-level bake made for Hogwarts Halloween parties, Harry Potter birthdays, or a wizarding world dessert table.
The silicone cauldron molds with a matte black finish and classic cauldron shape give the cakes wizarding world theming before the frosting even goes on. The hidden chocolate syrup center is a magical touch – no one knows it’s there until the first bite. The red and yellow buttercream piped on top and swirled together with a toothpick creates that molten, potion-bubbling effect.
How to Make Harry Potter Cauldron Cakes
Harry Potter Cauldron Cakes
Equipment
- 8 silicone oven-safe mini cauldron molds Available at Michaels
- Sheet pan
- Stand mixer or handheld mixer with paddle attachment
- Two piping bags fitted with star tips
Ingredients
Cakes
- 1 box devil's food cake mix
- 1 cup water
- 3 eggs
- ½ cup vegetable oil
- 1 cup Mrs. Richardson's chocolate syrup
Buttercream
- 1 cup (2 sticks) unsalted butter, softened to room temperature
- 4½ cups confectioners' sugar
- ¼ cup heavy cream or whole milk
- 2 teaspoons pure vanilla extract
- Pinch of salt
- Red and yellow gel food coloring
Instructions
- Preheat the oven to 350°F. Prepare the devil's food cake mix according to package directions. Place the silicone cauldron molds on a sheet pan. Divide the batter evenly between the 8 molds, filling each about two-thirds full. Bake for approximately 20 minutes, or until a toothpick inserted into the center comes out clean.
- Remove from the oven and allow the cakes to cool completely on a wire rack before decorating.
- While the cakes cool, make the buttercream. Beat the softened butter on medium speed until smooth and creamy, about 2 minutes. Add 4½ cups confectioners' sugar, heavy cream, and vanilla extract. Beat on low for 30 seconds to combine, then increase to medium-high and beat for 2 full minutes until light and fluffy. Add a pinch of salt and mix briefly.
- Divide the buttercream between two bowls — about three-quarters into one bowl and one-quarter into the other. Tint the larger portion red and the smaller portion yellow using gel food coloring. Transfer each color into a piping bag fitted with a star tip.
- Once the cakes are fully cooled, use a small sharp knife to cut a 1" divot out of the center of each cake. Spoon 2 tablespoons of chocolate syrup into each cavity. Trim the divot piece flat and press it back into the reservoir over the syrup to seal it in.
- Pipe the red buttercream over the surface of each cake in spiky or swirly designs, covering the top completely. Add yellow buttercream accents. Use a toothpick to swirl the two colors together until the frosting looks like a bubbling potion.
Bake Cake in Cauldrons
Create a Divot for Hot Fudge Sauce
Top with Buttercream & Swirl
Tips and Tricks
- Place the silicone molds on a sheet pan before filling — they’re flexible and will buckle if you try to move them once they have batter in them.
- Fill each mold only two-thirds full. Devil’s food cake rises significantly and overfilled molds will dome above the rim and lose the cauldron shape.
- Gel food coloring gives you a deeper, truer red than liquid coloring. Start with a small amount and add more gradually.
- The chocolate syrup center is easier to manage if the cakes are completely cool before you cut the divot.
- Store finished cakes in an airtight container in the refrigerator. Allow them to come to room temperature for about 20 minutes before serving so the buttercream softens slightly.
For this recipe, the cauldron mold really makes the difference — they make the cakes look like they belong on the Hogwarts Express trolley. If you’re building out a full Hogwarts Halloween spread, they pair well with the pretzel broomsticks and chocolate caramel pretzel wands for a table that mixes sweet and savory.
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