Viral Chocolate Custard-Core October Cake
Fluffy vanilla-yogurt sponge baked around a rich, molten dark chocolate custard center that flows with every tender forkful.
In a nutshell: This authentic european-american viral chocolate custard-core october cake comes together in just 1 hr 5 mins using simple whole ingredients. The chef's secret is to Let the chocolate custard cool to room temperature or chill slightly so it holds its shape. Perfect for home cooks seeking a dependable, restaurant-quality finish with minimal effort.
This Viral Chocolate Custard-Core October Cake is the breakout sensation sweeping bakeries and FoodTok! Tender, golden vanilla yogurt sponge cake baked in a single pan with a luscious homemade dark chocolate custard core hidden inside. Light, velvety, and deeply chocolatey with bakery-level elegance.
Key Equipment
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- 8-inch springform or round cake pan
- Parchment paper
- Saucepan & whisk
- Hand or stand mixer
- Wire cooling rack
Chef's Pro-Tips
- Chill the custard before baking: Let the chocolate custard cool to room temperature or chill slightly so it holds its shape as a solid core when piped into the batter, preventing it from blending into the cake.
- Use whole-milk Greek yogurt: High-protein whole milk Greek yogurt provides essential moisture and acidity, ensuring the vanilla crumb stays feather-light and tender.
- Do not overbake: Pull the cake when a toothpick inserted into the sponge ring (away from the center) comes out clean; the custard center will remain delightfully soft and molten.
Ingredients
8
servings
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1 ½ cups whole milk, divided: 1.25 cups for custard, 0.25 cup for cake batter
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½ cup granulated sugar, for chocolate custard
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3 tbsp cornstarch, for thickening velvety custard
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2 tbsp unsweetened Dutch-process cocoa powder, sifted
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½ cup dark chocolate chips, 60% cacao, melted into custard
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1.75 cups all-purpose flour, spooned and leveled
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1 ½ tsp baking powder & 0.5 tsp baking soda, for gentle rise
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½ tsp fine sea salt, flavor balance
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2 large eggs, room temperature
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¾ cup granulated sugar, for cake batter
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½ cup plain whole-milk Greek yogurt, room temperature, adds moisture
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⅓ cup neutral vegetable oil or melted butter, for tender crumb
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1 ½ tsp pure vanilla extract, divided
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2 tbsp powdered sugar & cocoa powder, for dusting finished cake
Step-by-Step Instructions
Cook the Chocolate Custard
In a medium saucepan, whisk together 1/2 cup sugar, cornstarch, and cocoa powder. Whisk in 1.25 cups whole milk until smooth. Cook over medium heat, whisking constantly, until mixture thickens into a glossy pudding (about 4–5 minutes). Remove from heat, stir in dark chocolate chips and 1/2 tsp vanilla until melted and silky. Let cool to room temperature.
Prep Pan & Preheat Oven
Preheat oven to 350°F (175°C). Butter and line an 8-inch round springform or cake pan with parchment paper.
Whisk Dry Ingredients
In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
Make Sponge Batter
In a large bowl with an electric mixer, beat eggs and 3/4 cup sugar for 3 minutes until pale and voluminous. Beat in Greek yogurt, vegetable oil, remaining 1/4 cup milk, and 1 tsp vanilla. Fold in dry flour mixture just until smooth and lump-free.
Assemble & Bake
Pour two-thirds of the vanilla batter into prepared pan. Spoon the cooled chocolate custard into a mound directly in the center. Spread remaining vanilla batter over top and around sides to enclose the custard core. Bake at 350°F for 38–42 minutes until the cake ring is golden and springs back to the touch. Cool for 20 minutes, dust with powdered sugar and cocoa powder, and slice warm!
Chef Clara's Kitchen Picks
Kitchen EssentialsAs an Amazon Associate I earn from qualifying purchases.
Nordic Ware Naturals Half Sheet, 2-Pack
Warp-resistant aluminum for even browning, from sheet-pan dinners to cookies.
View on AmazonVictorinox Fibrox Pro 8" Chef's Knife
Razor-sharp Fibrox Pro blade that home chefs and pros both reach for.
View on AmazonTILUCK Stainless Measuring Cups & Spoons, 10-Pc
Stainless steel cups and spoons that measure precisely and last.
View on AmazonMercer Culinary Locking Tongs, 9" + 12"
Locking tongs in two handy sizes for the stovetop and the grill.
View on AmazonAmazon Basics Non-Stick Parchment Paper Roll
Non-stick paper for lining pans – easy release, easy cleanup.
View on AmazonWoodenhouse Teak Wooden Spoons, 10-Pc
Teak spoons gentle on cookware and built for daily stirring.
View on AmazonOXO Good Grips Silicone Whisk Set, 9" + 11"
Silicone whisks safe for nonstick pans, in two sizes.
View on AmazonUltra Cuisine Stainless Cooling Rack Set of 2
Stainless racks that fit half sheets – for cooling bakes and crisping roasts.
View on AmazonUmite Chef Stainless Mixing Bowls with Lids, 8-Pc
Nesting stainless bowls with airtight lids, from prep to storage.
View on AmazonHamilton Beach 6-Speed Electric Hand Mixer
Six speeds with a snap-on storage case for the beaters.
View on AmazonFrequently Asked Questions
Yes! Cook the chocolate custard up to 2 days in advance and refrigerate with plastic wrap pressed directly against the surface.
Yes, serving warm delivers the maximum molten custard lava flow! You can also enjoy it chilled like a classic Boston cream cake.
Cover tightly and refrigerate for up to 4 days. Warm individual slices in the microwave for 15 seconds before eating.
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