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9×13-inch baking dish
Mixing bowls
Whisk
Spatula
Saucepan (for ganache)
Offset spatula or knife for spreading
Refrigerator for chilling
How to Make Boston Cream Dessert Bars
Step 1: Prepare the Cake Base
Begin by baking the yellow cake base according to the instructions on the cake mix package, but in a 9×13-inch baking dish for an even layer. Once baked, allow the cake to cool completely in the dish. You may need to trim the cake if it rises too much, as a flat base is ideal for layering the custard and ganache.
Step 2: Make the Custard Filling
In a medium bowl, combine the instant vanilla pudding mix, milk, heavy cream, and vanilla extract. Whisk until smooth and thickened, about 2-3 minutes. The mixture should be creamy and set, resembling a custard.
Once the custard is ready, spread it evenly over the cooled cake base in the baking dish. Use an offset spatula to create a smooth, even layer. Place the dish in the refrigerator while you prepare the ganache topping.
Step 3: Prepare the Chocolate Ganache
In a saucepan over medium heat, warm the heavy cream until it just begins to simmer. Remove from heat and pour the hot cream over the chocolate chips in a heatproof bowl. Let it sit for 1-2 minutes to melt the chocolate, then stir until smooth and glossy.
Allow the ganache to cool slightly before pouring it over the custard layer. Carefully spread the ganache over the custard, ensuring an even layer that reaches all edges. This chocolate layer will create that classic Boston cream pie look.
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