Name: Boston Cream Whoopie Pies
Prep time: 1 h 30 min
Cook time: 10 min
Total time: 1 h 40 min
Yield: 14 whoopie cakes
Cuisine: American
Ingredients: 2.5 cups all-purpose flour; 1.5 teaspoons baking powder; 0.5 tsp baking soda; 0.5 tsp salt; 5 tablespoons unsalted butter; 0.5 cup granulated sugar; 0.5 cup brown sugar; 1 egg; 1 tsp vanilla extract; 0.96 cup buttermilk; 0.25 cup heavy cream; 2 ounces chocolate

From the light vanilla cake to the pastry cream to the chocolate ganache, these Boston cream whoopie pies have every element of a traditional Boston cream pie! The whoopie pies are made with a simple cake batter piped into perfect rounds and baked up into light & fluffy mini cakes. A silky ganache is spread on the tops and the paired cakes are sandwiched with a smooth, sweet pastry cream.

Dessert

1 h 40 m

American

Sloane’s Table

March 13, 2026

Atsloanestable.com

From the Cook

1/4

Boston Cream Whoopie Pies

Sloane’s Table Verified

Atsloanestable.com

Ingredients

Warning0 allergens identified

Boston Cream Whoopie Pies

2 ½ cups all-purpose flour

1 ½ teaspoons baking powder

½ tsp baking soda

½ tsp salt

5 tablespoons unsalted butter

½ cup granulated sugar

½ cup brown sugar

1 egg

1 tsp vanilla extract

1 cup buttermilk

¼ cup heavy cream

2 ounces chocolate

Instructions

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Instructions

Preheat the oven to 375 degrees F (190 degrees C) and line two baking sheets with parchment paper.

On another piece of parchment paper, trace 2" circles spaced about 2" apart.

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

In a large bowl with an electric mixer, beat the butter and sugars together for 2-3 minutes.

Mix in the egg and vanilla until fully combined.

In two additions, alternate folding in the dry ingredients and buttermilk with a rubber spatula.

Transfer the batter to a piping bag with a large round piping tip.

Place your template under a piece of parchment paper on a baking sheet and pipe perpendicular to fill each circle.

Bake the whoopie pies for about 10 minutes or until just barely golden on the edges.

Allow to cool completely before assembling.

In a small saucepan, place the milk over low-medium heat and bring to a simmer or about 190 degrees F (85 degrees C).

Meanwhile, in a medium bowl, vigorously whisk together the egg yolks, granulated sugar, and cornstarch until pale in color and the mixture flows off of the whisk.

Once the milk has reached a simmer, slowly pour half of it into the egg-sugar mixture while simultaneously whisking to temper the eggs. Pour everything back into the saucepan and place over medium heat. Use a rubber spatula to mix constantly as it thickens.

Once the pastry cream is thick and a few big bubbles come to the surface, continue whisking for one more minute, then remove the pan from heat.

Immediately add the butter and vanilla, and use an immersion blender (or rubber spatula) to combine. Pour the pastry cream through a fine mesh sieve into a small bowl to ensure it’s perfectly smooth.

Press plastic wrap up against the surface of the pastry cream to prevent a skin from forming, and place in the fridge to chill overnight or until ready to use.

In a medium bowl, heat the heavy cream in the microwave for about 30 seconds.

Stir in the chocolate until fully melted.

Pair the whoopie pies up, then spread the chocolate ganache on the top ones. Allow to set for a few minutes.

Spread the pastry cream on the bottom ones and gently sandwich with the tops.

Nutrition

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Tips & Tricks (5)

Pipe with Consistent Pressure 🎯
Use a piping bag with a round tip and apply even pressure to create uniform-sized cake rounds, ensuring they bake evenly and pair perfectly for sandwiching.
Temper Your Cream Filling ❄️
Allow pastry cream to cool to room temperature before piping between cakes to prevent melting the chocolate ganache topping and ensure clean, defined layers.
Ganache Consistency is Key 🍫
Let your ganache cool for 2-3 minutes after pouring before spreading—it should be spreadable but not runny; this prevents it from dripping off the delicate cake tops.
Measure Buttermilk Accurately 🥛
Use fresh buttermilk and measure it precisely, as it reacts with baking soda to create the light, fluffy texture essential to these delicate whoopie pies.
Cool on Racks Before Assembly 🧊
Let baked cake rounds cool completely on wire racks for at least 15 minutes before filling and topping to prevent the ganache and cream from sliding off warm cakes.