Boston Cream Poke Cake With Rich Ganache Topping

Boston cream poke cake takes the flavors of a Boston cream pie, yellow cake, vanilla custard-style filling and chocolate on top, and turns them into one easy sheet-pan dessert. A box cake mix does the baking, instant pudding and sweetened condensed milk soak into holes poked in the cake, and a simple ganache finishes it. It serves 12 and needs about 45 minutes of active time, plus chilling.

Ingredients for Boston Cream Poke Cake

For the Cake

• 1 box yellow cake mix, plus ingredients listed on the box
• 1 teaspoon vanilla extract

For the Filling

• 1 (3.4-ounce) box instant vanilla pudding mix
• 2 cups cold whole milk
• 1 (14-ounce) can sweetened condensed milk

For the Chocolate Topping

• 1 cup semi-sweet chocolate chips
• 3/4 cup heavy cream
• 2 tablespoons butter

Baking, Poking and Topping the Cake

1. Prepare the yellow cake mix according to the package directions and stir in the vanilla extract. Bake in a greased 9×13-inch baking dish until the top is golden and springs back lightly when pressed in the center.
2. Let the cake cool for about 10 minutes. Use the handle of a wooden spoon to poke holes all across the cake, spacing them about 1 inch apart. The holes should go almost to the bottom so the filling can soak through every layer.

3. In a large bowl, whisk together the instant pudding mix, cold milk, and sweetened condensed milk until smooth and slightly thickened. Pour the mixture slowly over the warm cake, making sure it settles into the holes instead of pooling only on top.
4. Refrigerate the cake for at least 1 hour so the filling can firm up. The surface should feel cool and slightly set before adding the chocolate layer.
5. Heat the heavy cream and butter in a small saucepan over medium-low heat until steaming but not boiling. Pour over the chocolate chips and let sit for 2 minutes. Stir until glossy and smooth with no streaks remaining.
6. Spread the chocolate ganache evenly over the chilled cake. Chill again for at least 30 minutes, or until the topping is set enough to slice cleanly.

Why Poke Cakes Stay Moist

The filling sinks directly into the baked crumb, so the cake stays soft for days instead of drying out as many layer cakes do. The pudding gives the cake a custard-like flavor, and the condensed milk adds richness and sweetness. A ganache topping, rather than a thick frosting, balances the sweetness and firms up slightly in the fridge while staying soft enough to cut with a fork.

Getting the Holes and Filling Right

• Poke while the cake is slightly warm. The card has you poke after a 10-minute rest and pour the filling over the warm cake, so it soaks in rather than sitting on top.
• Go deep, but keep the holes narrow. Holes that almost reach the bottom let the filling soak the whole cake. Very wide holes can make slices break apart.
• Filling pooling on top? The holes are probably too shallow or too far apart. Poke more, and pour slowly.
• Ganache looks oily or separated? Warm it gently and stir slowly until glossy again.
• Chill before slicing. Several hours in the fridge gives the cleanest squares.

Swaps and Shortcuts

• Without sweetened condensed milk: The filling works with only pudding and milk, but expect it to taste less rich and creamy. Heavy cream can add richness back.
• Homemade pastry cream: It gives a more traditional bakery-style filling in place of the pudding. Expect a slightly softer set, so chill it thoroughly.
• Whole milk: Use it for the filling. It makes a richer texture than skim milk.

Serving, Storing and Making Ahead

Serve the cake cold from the refrigerator, in small squares, with fresh strawberries or whipped cream if you like. It is a good make-ahead dessert because the filling has more time to soak in overnight. Cover it and refrigerate; the filling and milk make it perishable, so keep it out of the fridge for no more than 2 hours. Eat leftovers within 4 days.

To freeze, wrap individual slices tightly and keep them for up to 2 months, then thaw overnight in the refrigerator so the filling stays smooth.

More Boston Cream Desserts and Poke Cakes

Try the same flavors as Boston cream cupcakes or as no-oven Boston cream pie bars. For another poke cake that comes together the same way, see this Jello poke cake.

Boston Cream Poke Cake FAQ

Can I make it ahead?

Yes. Many people prefer it the next day because the filling has longer to soak into the cake. Store it covered in the refrigerator for up to 4 days.

Can I freeze it?

Yes, slice by slice. See the storage section above.

Why is my filling pooling instead of soaking in?

Usually the holes are too shallow or too far apart. Deeper, closer holes poked while the cake is still warm help it absorb.

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