A soft, buttery vanilla cake filled with silky vanilla pastry cream and topped with a rich chocolate ganache. This easy dessert is inspired by the classic Boston Cream Pie and is perfect for birthdays, potlucks, or any special occasion.

Prep Time: 20 minutes
Cook Time: 30 minutes
Chill Time: 2 hours
Total Time: 2 hours 50 minutes
Servings: 12

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Ingredients

Vanilla Cake

• 2 cups (250g) all-purpose flour
• 1½ teaspoons baking powder
• ¼ teaspoon salt
• ½ cup (115g) unsalted butter, softened
• 1 cup (200g) granulated sugar
• 3 large eggs
• 2 teaspoons vanilla extract
• ¾ cup (180ml) whole milk

Vanilla Cream Filling

• 2 cups (480ml) whole milk
• ½ cup (100g) granulated sugar
• 3 tablespoons cornstarch
• 3 large egg yolks
• 2 tablespoons unsalted butter
• 2 teaspoons vanilla extract

Chocolate Ganache

• 1 cup (170g) semi-sweet chocolate chips
• ½ cup (120ml) heavy whipping cream
• 1 tablespoon butter (optional, for extra shine)

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Instructions

Step 1: Bake the Cake

1. Preheat the oven to 350°F (175°C).
2. Grease and line a 9×13-inch baking pan.
3. Whisk together the flour, baking powder, and salt.
4. In a separate bowl, beat the butter and sugar until light and fluffy.
5. Add the eggs one at a time, then mix in the vanilla.
6. Alternate adding the dry ingredients and milk, mixing just until combined.
7. Pour the batter into the prepared pan.
8. Bake for 28–32 minutes, or until a toothpick inserted into the center comes out clean.
9. Cool for 10 minutes.

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Step 2: Prepare the Pastry Cream

1. In a saucepan, heat the milk until steaming but not boiling.
2. In a bowl, whisk together the sugar, cornstarch, and egg yolks.
3. Slowly whisk the warm milk into the egg mixture.
4. Return everything to the saucepan.
5. Cook over medium heat, whisking constantly, until thick and smooth.
6. Remove from the heat and stir in the butter and vanilla.
7. Let cool for about 10 minutes.

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Step 3: Fill the Cake

1. Use the handle of a wooden spoon to poke holes all over the warm cake.
2. Pour the pastry cream over the cake, spreading it gently so it fills the holes.
3. Refrigerate for 1 hour.

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Step 4: Make the Ganache

1. Heat the heavy cream until just simmering.
2. Pour it over the chocolate chips.
3. Let stand for 2 minutes, then stir until smooth.
4. Stir in the butter, if using.

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Step 5: Finish the Cake

1. Pour the ganache over the chilled cake.
2. Spread evenly with an offset spatula.
3. Refrigerate for at least 1 more hour before slicing.

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Nutritional Information (Per Serving)

Nutrition values are approximate.

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Tips for Success

• Poke plenty of holes so the pastry cream fills the cake evenly.
• Allow the cake to cool slightly before adding the filling.
• Chill thoroughly before slicing for clean, neat pieces.
• Use high-quality chocolate for the smoothest ganache.
• Store the cake refrigerated because of the cream filling.

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Variations

Easy Shortcut Version

Use a boxed vanilla cake mix and instant vanilla pudding to save time.

Chocolate Boston Cream Cake

Use a chocolate cake base instead of vanilla.

Coffee Chocolate Version

Add 1 teaspoon of instant espresso powder to the ganache.

Mini Cupcakes

Turn the recipe into Boston cream cupcakes by filling individual cupcakes with pastry cream and topping each with ganache.

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Storage

Refrigerator: Store covered for up to 4 days.

Freezer: Freeze the unfrosted cake for up to 2 months. Add the pastry cream and ganache after thawing for the best texture.

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Nut Information

Contains Peanuts? ❌ No

Contains Tree Nuts? ❌ No

Nut-Free Recipe: ✅ Yes

Allergy Note: This recipe is naturally nut-free. Always check the labels on chocolate chips, vanilla extract, and other packaged ingredients for allergen information and possible cross-contamination if preparing for someone with severe nut allergies.

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Frequently Asked Questions

1. Can I use instant pudding instead of homemade pastry cream?

Yes. Two boxes of instant vanilla pudding prepared according to the package directions make a quick substitute.

2. Why do I need to poke holes in the cake?

The holes allow the creamy filling to soak into the cake, making every bite moist and flavorful.

3. Can I make this a day ahead?

Absolutely. It actually tastes even better after chilling overnight.

4. Can I use milk chocolate instead of semi-sweet chocolate?

Yes, but the topping will be sweeter. Dark chocolate also works well for a richer flavor.

5. How do I know when the pastry cream is ready?

It should be thick enough to coat the back of a spoon and hold its shape when stirred.

6. Can I serve it warm?

This dessert is best served chilled so the pastry cream and ganache stay firm.

7. What can I garnish it with?

Chocolate curls, a dusting of cocoa powder, shaved chocolate, or fresh berries all make beautiful finishing touches.