No-Bake Custard Slice

Name: No-Bake Custard Slice
Prep time: 20 min
Cook time: 10 min
Total time: 4 h 30 min
Cuisine: Western
Ingredients: 2 packs plain graham crackers or digestive biscuits (or vanilla wafers); 4 cups milk; 1/2 cup sugar; 1/3 cup cornstarch; 2 tsp vanilla extract; 3 egg yolks; 2 tbsp butter; 1 cup powdered sugar; 1-2 tbsp milk; 1/2 tsp vanilla

Isabella

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I love how this No-Bake Custard Slice combines layers of crunchy biscuits with smooth, creamy custard and a sweet icing finish. It’s a simple dessert that doesn’t need any baking, making it perfect for warm days or when I want a fuss-free treat.

Why You’ll Love This Recipe

I enjoy this recipe because it’s straightforward, quick to assemble, and requires minimal ingredients that I usually have at home. The custard filling is silky and rich, balanced perfectly by the crisp layers of biscuits. Plus, the icing on top adds just the right touch of sweetness to finish it off. It’s also versatile enough to adapt with different biscuits or toppings, so I can always switch things up to suit my mood.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Base & Top:

2 packs plain graham crackers or digestive biscuits (or vanilla wafers)

Custard Filling:

4 cups milk

1/2 cup sugar

1/3 cup cornstarch

2 tsp vanilla extract

3 egg yolks

2 tbsp butter

Icing:

1 cup powdered sugar

1-2 tbsp milk

1/2 tsp vanilla

Directions

Line an 8×8 or 9×9 square pan with parchment paper.

Arrange a layer of biscuits to cover the bottom of the pan.

Make the custard:

In a saucepan, whisk together the milk, sugar, and cornstarch until smooth.

Heat over medium, stirring constantly. When the mixture is hot, slowly whisk in the egg yolks.

Continue stirring until the custard thickens, about 5 to 7 minutes.

Remove from heat, then stir in the butter and vanilla extract until fully combined.

Assemble the slice:

Pour half of the custard over the biscuit layer.

Add another biscuit layer on top of the custard.

Pour the remaining custard over the second biscuit layer.

Finish with a final layer of biscuits.

Add icing:

Mix the powdered sugar, milk, and vanilla for the icing until smooth.

Spread the icing evenly over the top biscuit layer.

Chill the slice in the fridge for at least 4 hours; overnight chilling works best to let the flavors meld and the custard set.

Slice into squares and serve chilled.

Servings and Timing

This recipe serves about 9 to 12 slices depending on how large I cut them. The preparation takes around 20 minutes, but chilling time requires at least 4 hours, so I usually prepare it the day before.

Variations

I like experimenting with this custard slice:

Swap plain biscuits for chocolate-flavored ones for a richer taste.

Instead of the icing, I sometimes dust the top with powdered sugar or drizzle melted chocolate.

Toasted coconut sprinkled on top adds a lovely crunch and tropical flair.

For a citrus twist, adding a bit of lemon or orange zest to the custard brightens the flavor.

Using almond extract instead of vanilla gives the custard a unique aroma.

Storage/Reheating

I store the custard slice in an airtight container in the fridge. It keeps well for up to 3 days, and the flavors actually improve after sitting overnight. Since it’s a no-bake chilled dessert, I don’t recommend reheating it; instead, I enjoy it cold straight from the fridge.

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FAQs

How long does the custard slice last in the fridge?

I find it stays fresh and delicious for about 3 days when properly covered.

Can I use a different type of biscuit?

Absolutely! I’ve used digestive biscuits, graham crackers, vanilla wafers, and even chocolate biscuits with great results.

Is it possible to make this recipe dairy-free?

Yes, I substitute the milk and butter with dairy-free alternatives like almond milk and vegan butter, which works quite well.

Can I prepare this slice in advance?

Definitely. I often make it the night before to allow the custard to set and the flavors to develop fully.

What if I don’t have cornstarch?

You can replace cornstarch with an equal amount of plain flour, but the custard might be slightly less smooth.

Conclusion

This No-Bake Custard Slice is one of my favorite go-to desserts when I want something creamy, satisfying, and easy to make without turning on the oven. The layers of biscuits and custard, topped with sweet icing, create a delightful treat that’s perfect for any occasion. I enjoy how customizable it is, and it always impresses guests with its classic flavor and smooth texture.

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