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Boston Cream Filling

This versatile Boston Cream Filling is a silky, vanilla-infused custard perfect for donuts, cakes, or even as a standalone dessert. The classic recipe creates a smooth, rich texture that can be easily customized with whipped cream for a lighter mousse-like consistency or with melted baking chocolate for a decadent twist.
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Prep Time 15 minutes
Cook Time 10 minutes
Total Time 45 minutes
Servings: 4 servings
Course: Dessert
Cuisine: American
Calories: 485
Ingredients Equipment Method Notes

Ingredients
  

For the Filling
  • 1/2 cup sugar
  • 1/4 cup cornstarch
  • 1/4 teaspoon salt
  • 2 cups milk
  • 4 egg yolks
  • 1 teaspoon vanilla extract preferably pure vanilla extract
Optional Additions
  • 1 cup whipped cream Fold in after cooling for a lighter, mousse-like texture
  • 2 ounces baking chocolate Melted, for a chocolate version

Equipment

  • Medium saucepan
  • Wire whisk
  • Bowl
  • Plastic wrap
  • Refrigerator

Method
 

  1. In a medium saucepan, combine 1/2 cup sugar, 1/4 cup cornstarch, and 1/4 teaspoon salt. Whisk the dry ingredients together thoroughly to prevent lumps.
  2. Add 2 cups milk, 1 teaspoon vanilla extract, and 4 egg yolks to the dry mixture. Whisk until the mixture becomes completely smooth.
  3. Place the saucepan over medium heat and stir constantly. Continue stirring for about 5-8 minutes until the custard thickens enough to coat the back of a spoon.
  4. Remove the saucepan from heat and transfer the custard to a bowl. Immediately place a piece of plastic wrap directly on the surface to prevent a skin from forming.
  5. Allow the filling to cool completely in the refrigerator. Once cooled, if desired, gently fold in 1 cup of whipped cream for a lighter texture or stir in 2 ounces of melted baking chocolate for a chocolate twist.

Notes

This Boston Cream Filling recipe is both simple and adaptable. You can create a dairy-free version by using coconut milk instead of regular milk, and you can easily adjust the sweetness by reducing the sugar. Optional additions like whipped cream or melted baking chocolate offer creative variations that elevate the classic custard. Store any leftovers in an airtight container in the refrigerator and use the filling in desserts like Boston cream pie, cream puffs, or as a delightful sandwich spread for biscuits.