Boston Cream Bars

Back in my days at the grocery store…..the fake and bake days, we got all of our cakes frozen in either sheets or rounds. From yellow rounds, bavarian cream, and melted chocolate icing I made Boston Cream Pies. So, when I came across this recipe for Boston Cream Pie Bars I had to try them.
Boston Cream Pie Bars

Can you say yummy? They were really good. Cake mix, oil, eggs, and cream make the base.

I had little experience with custard……..I did good! At first I thought is was going to be a fail but as I stirred and stirred it came together perfectly. Tempering is the key, so follow the directions to the letter.

Boston Cream Pie Bars

And what can you say about Ganache…….its chocolate, and chocolate is the sweet world is like bacon in the savory world…..its makes everything better.

Now, a couple of things about these bars
NOT low calorie
Slightly time consuming

Boston Cream Pie Bars

But worth every minute! Perfect for a little dessert that is rich, creamy, and decadent!

Thank you to Spend with Pennies for such a tasty version of a classic Boston Cream Pie Bars.

Boston Cream Pie Bars Collage

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Boston Cream Bars

  • Author: Spend with Pennies
  • Yield: 16 1x


  • Bottom Layer
  • 1 box yellow cake mix
  • ⅓ cup vegetable oil
  • 2 eggs
  • 3 tablespoons cream
  • Custard
  • ½ cup sugar divided
  • 2 cups milk
  • 1 teaspoon vanilla
  • 4 egg yolks
  • 6 tablespoons cornstarch
  • Ganache
  • 9oz semi-sweet chocolate chips
  • 1 cup heavy cream
  • 1 tablespoon butter


  1. Preheat oven to 350 degrees. Line an 8×8 pan with foil.
  2. In a large bowl, combine cake mix, oil, eggs & cream. Whisk until smooth, about 2 minutes. Spread into prepared pan and bake 18-20 minutes. Remove from oven and cool completely.
  3. Custard
  4. Over medium heat, combine milk and ¼ cup sugar. Bring just to a boil.
  5. In a small bowl, whisk egg yolks with ¼ cup sugar and vanilla. Add in cornstarch until completely mixed and smooth.
  6. Add 1 cup of the hot milk to the yolks and stir well. Pour the yolk mixture back into the pot and whisk continuously over medium heat until mixture thickens. Cool slightly in the pot for about 15 minutes, stirring every 5 minutes. Spread custard over prepared bottom and refrigerate until completely cooled.
  7. Ganache
  8. Bring heavy cream just to a boil and immediately remove from heat. Add chocolate chips and do not stir. Let sit 5 minutes add butter and whisk until completely smooth. Pour over custard layer and let cool at room temperature 30 minutes. Refrigerate until serving.