The Ingredients
Component Ingredient Amount
Shortbread Crust All-purpose flour 1¼ cups (156g)
Granulated sugar ¼ cup (50g)
Salt ½ teaspoon
Unsalted butter ½ cup (1 stick), chilled and cubed
Egg yolk 1 large
Custard Filling Whole milk 1 cup (estimated)
Heavy cream 1 cup (estimated)
Egg yolks 4 large
Granulated sugar ½ cup
Cornstarch 3 tablespoons
Vanilla extract 1 teaspoon
Finish Powdered sugar For dusting
The Method
Step 1: Make the Crust
Preheat oven to 350°F (175°C). In a food processor, combine flour, sugar, and salt. Add cold butter and pulse until mixture resembles coarse crumbs. Add egg yolk and pulse until dough just begins to come together .
Press the dough firmly into the bottom of a parchment-lined 9×9-inch pan. Prick with a fork and bake for 15-18 minutes until lightly golden .
Step 2: Make the Custard
In a saucepan, heat milk and cream until just simmering. In a bowl, whisk egg yolks, sugar, and cornstarch until smooth . Slowly pour half the hot milk into the egg mixture, whisking constantly (this tempers the eggs). Return to the saucepan and cook over medium heat, stirring constantly, until thickened (about 5-7 minutes). Remove from heat and stir in vanilla .
Step 3: Assemble and Bake
Pour the warm custard over the pre-baked crust. Return to the oven and bake for 20-25 minutes, until the custard is set around the edges but still slightly jiggly in the center .
Step 4: Chill
Cool completely at room temperature, then refrigerate for at least 2-3 hours (overnight is best) .
Step 5: Serve
Dust with powdered sugar, slice into squares, and serve chilled.
Version 3: Graham Cracker Crust Vanilla Custard Cream Squares
This version uses a no-bake graham cracker crust and adds a fluffy whipped cream topping—the quickest and easiest of the three .
The Ingredients
Component Ingredient Amount
Crust Graham cracker crumbs 1½ cups
Unsalted butter ½ cup, melted
Granulated sugar ¼ cup
Custard Filling Whole milk 2 cups
Granulated sugar ½ cup
Cornstarch ¼ cup
Salt ¼ teaspoon
Egg yolks 4 large
Unsalted butter 2 tablespoons
Vanilla extract 2 teaspoons
Whipped Cream Topping Heavy whipping cream 1½ cups
Powdered sugar ½ cup
Vanilla extract 1 teaspoon
The Method
Step 1: Make the Crust
Preheat oven to 350°F (175°C). Mix graham cracker crumbs, melted butter, and sugar. Press firmly into the bottom of an 8×8-inch pan . Bake for 8-10 minutes, then cool completely.
Step 2: Make the Custard
In a saucepan, whisk together sugar, cornstarch, and salt. Gradually whisk in milk. Cook over medium heat, stirring constantly, until thickened and just beginning to bubble .
In a separate bowl, lightly beat egg yolks. Slowly whisk about ½ cup of the hot milk mixture into the yolks to temper them. Pour the egg mixture back into the saucepan and cook for another 2-3 minutes, stirring constantly, until thickened .
Remove from heat and stir in butter and vanilla until smooth .
Step 3: Chill the Custard Layer
Pour the warm custard over the cooled crust. Cover with plastic wrap pressed directly onto the surface (to prevent a skin from forming) . Refrigerate for at least 2 hours until set.
Step 4: Make the Whipped Cream Topping
Beat heavy cream, powdered sugar, and vanilla until stiff peaks form .
Step 5: Finish and Serve
Spread the whipped cream over the set custard. Slice into squares and serve chilled .
Pro-Tips for Custard Square Perfection
1. Temper Your Eggs
Never add hot milk directly to eggs—this creates scrambled eggs, not smooth custard. Always whisk the hot liquid slowly into the eggs while stirring constantly .
2. Strain If Needed
For the silkiest custard, strain it through a fine-mesh sieve after cooking to catch any tiny lumps .
3. Press Plastic Wrap Directly on the Surface
To prevent a skin from forming on your custard while chilling, press plastic wrap directly onto the surface .
4. Chill Thoroughly
These desserts need time to set. Overnight chilling yields the cleanest slices and best texture .
5. Use a Sharp Knife
For clean cuts, use a sharp knife and wipe it clean between slices. A serrated knife works best for puff pastry versions .
6. Dust Just Before Serving
Powdered sugar can dissolve into the dessert if left too long. Dust right before serving for that beautiful finish .
Storage and Make-Ahead Wisdom
Refrigerator:
Store covered for up to 3-5 days . These desserts actually improve after a day in the fridge as flavors meld.
Freezer:
Not recommended for versions with custard—the texture will suffer upon thawing . Some sources suggest puff pastry versions can be frozen in individual portions, but expect some texture change .
Make-Ahead:
These are perfect make-ahead desserts. Assemble a day before serving—they’ll be even better.
Your Vanilla Custard Squares Questions, Answered
What’s the difference between these and a Napoleon/Mille-feuille?
They’re very similar! The main difference is that traditional mille-feuille has multiple thin layers of pastry alternating with custard, while these squares typically have a pastry base and top with a thick custard layer in between .
Can I use store-bought pudding mix?
You can, but homemade custard has incomparably better flavor and texture. If using instant pudding, follow package directions and proceed with layering.
My custard is lumpy. What went wrong?
Either the eggs weren’t tempered properly, or the heat was too high. Next time, whisk constantly and cook over medium heat.
Can I make these gluten-free?
Yes! For the puff pastry version, use gluten-free puff pastry (available at many stores). For the shortbread version, use a 1:1 gluten-free flour blend.
