Boston Cream Poke Cake with Vanilla Custard and Chocolate Ganache 🍮🍫

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Hi, I’m Raya, welcome back to my kitchen! 👋 Today I’m sharing a dessert that takes the flavors of Boston’s famous dessert and makes them easier than ever, my Boston cream poke cake. A soft vanilla cake is poked full of holes, filled with silky homemade vanilla custard, and topped with a glossy chocolate ganache. Boston cream pie is actually the official state dessert of Massachusetts, and this poke cake version brings all that custardy, chocolatey goodness to a simple one-pan cake. Every bite is creamy, soft, and rich. Grab your whisk and a wooden spoon, and let us bake something wonderful together!

Why You’ll Love This Recipe 💕

• Custard in Every Bite: The warm custard seeps into the holes, so every forkful has soft cake and creamy filling.
• Glossy Chocolate Top: A simple two-ingredient ganache sets into a shiny, fudgy layer.
• Easier Than Boston Cream Pie: No layers, no splitting cakes, and no fancy assembly.
• Perfect for Potlucks: It is made in one pan and travels well, with no fussy decorations.
• Better the Next Day: Chilling lets the custard fully soak into the cake, so make-ahead is a bonus.

Key Ingredients for Boston Cream Poke Cake 🛒

For the Vanilla Cake

• All-Purpose Flour (2 1/2 cups / 315g): The base of a soft, sturdy cake.
• Baking Powder (2 1/2 tsp) and Fine Sea Salt (1/2 tsp): For lift and balance.
• Unsalted Butter (3/4 cup / 170g, softened): Makes the cake rich and tender.
• Granulated Sugar (1 1/2 cups / 300g): Sweetens the cake.
• Large Eggs (3, room temperature): Add structure and richness.
• Pure Vanilla Extract (2 tsp): Gives the cake its classic flavor.
• Whole Milk (1 1/4 cups / 300ml, room temperature): Keeps the crumb soft.

For the Vanilla Custard

• Whole Milk (3 cups / 720ml): The base of the custard.
• Granulated Sugar (3/4 cup / 150g): Sweetens the custard.
• Cornstarch (1/4 cup / 30g): Thickens the custard so it stays in the cake.
• Egg Yolks (4): Make the custard rich and silky.
• Unsalted Butter (2 tbsp / 28g), Vanilla Extract (2 tsp), Fine Sea Salt (pinch): For smoothness and flavor.

For the Chocolate Ganache

• Semi-Sweet Chocolate (8 oz / 225g, finely chopped): A good bar melts smoothly.
• Heavy Cream (2/3 cup / 160ml): Makes the ganache pourable and glossy.

Baker’s Note: The custard should be thick enough to coat a spoon but still pourable while warm. Pouring it slowly in several rounds lets the cake absorb it instead of letting it pool on top. If you love sheet cakes and potluck desserts, check out my Texas Sheet Cake and my Coca-Cola Cake.

Step-by-Step Instructions 👩‍🍳

Step 1: Bake the Vanilla Cake

Preheat your oven to 350°F (175°C). Grease a 9×13-inch (23×33 cm) baking dish and line it with parchment paper. Whisk the flour, baking powder, and salt. Beat the butter and sugar for 3 minutes until light and fluffy. Add the eggs one at a time, then the vanilla. Add the dry ingredients in 3 parts, alternating with the milk, and mix until just combined. Spread the batter in the dish and bake for 30 to 35 minutes, until golden and a toothpick comes out clean.

Step 2: Make the Custard

Whisk the sugar, cornstarch, and salt in a saucepan. Whisk in the milk and egg yolks until smooth. Cook over medium heat, whisking constantly, for 6 to 8 minutes until the custard thickens and bubbles. Cook 1 more minute, then remove from the heat and stir in the butter and vanilla.

Step 3: Poke the Holes

Let the cake cool for 15 minutes. Use the handle of a wooden spoon to poke holes about 1 inch (2.5 cm) apart all over the cake, going about three-quarters of the way down.

Step 4: Pour the Custard

Pour the warm custard slowly over the cake, in several rounds, nudging it into the holes with a spatula. Spread any remaining custard in a thin layer on top.

Step 5: Chill the Cake

Refrigerate the cake for 1 hour so the custard can settle and the top can firm up.

Step 6: Make the Ganache

Place the chopped chocolate in a bowl. Heat the cream until steaming and pour it over the chocolate. Let it sit for 2 minutes, then stir until glossy. Cool for 10 minutes until pourable but slightly thickened.

Step 7: Pour and Chill

Pour the ganache over the chilled cake and spread it gently to the edges. Refrigerate for at least 2 hours, until the ganache is set and the custard is cold.

Baker’s Tips for Success 💡

• Cook the Custard Fully: Let it bubble for a full minute so the cornstarch thickens properly.
• Poke Deep Holes: Wide, deep holes let the custard travel through the cake instead of sitting on top.
• Pour Slowly: Pouring in rounds lets the cake absorb the filling, which keeps the cake moist.
• Cool the Ganache Slightly: Ganache that is too hot melts the custard and slides off.
• Chill Before Cutting: A cold cake gives clean, neat squares with distinct layers.

Want to learn about the original? 🍮 Read the history of Boston cream pie and how it became the official dessert of Massachusetts.

How to Serve Boston Cream Poke Cake 🍽️

Cut the chilled cake into squares and serve straight from the fridge. A few fresh raspberries on the side add a nice tart contrast to the rich custard and chocolate.

How to Store Boston Cream Poke Cake 🧊

• In the Refrigerator: Keep the cake covered for up to 4 days because of the custard. Do not leave it out for more than 2 hours.
• In the Freezer: Custard does not freeze well, so I recommend enjoying this cake fresh.

Frequently Asked Questions ❓

Can I use a boxed cake mix?

Yes. A yellow or white cake mix works well, so bake it according to the box in a 9×13-inch pan and continue with the poking and the custard.

Can I use instant pudding instead of homemade custard?

Yes, as a shortcut. Prepare instant vanilla pudding using slightly less milk than the box says, so it stays thick enough to hold inside the cake.

Why did my custard sit on top of the cake?

The holes were probably too small or the custard was too thick. Poke wider holes and pour the custard while it is still warm.

Can I make Boston cream poke cake ahead of time?

Absolutely. It tastes even better the next day, so you can make it a full day before serving and keep it in the fridge.