In a nutshell: Custard powder is a starch-based dessert mix that thickens with milk into a smooth, custard-style sauce. It’s typically made from cornstarch with vanilla flavor and a touch of color, and it’s egg-free.

• When heated with milk and a little sugar, it becomes pourable custard.
• Comes in classic vanilla and fruit flavors, in instant or cook-type formats.
• Great for puddings, trifles, tarts, and as a warm sauce over cake or fruit.

Texture and sweetness vary by product and how you prepare it. For best results, follow the package directions and adjust the powder-to-milk ratio to get the thickness you prefer.

If you can’t find custard powder, several kitchen staples can play a similar role, depending on your recipe:

• Instant vanilla pudding mix: Use the dry mix in fillings or prepare it for a sauce-like texture.
• DIY thickener: Cornstarch + sugar + vanilla, cooked with milk for a simple custard-style sauce.
• Pastry cream from scratch: Not a powder, but a close stand-in for texture and richness.

Flavor and color may differ from traditional custard powder, so start with small batches and adjust sweetness and vanilla to taste. On Walmart.com, you’ll find custard powders and dessert mixes, with many items available for pickup or delivery.

Custard powder gives the filling its classic flavor, but you do have options when it’s not on hand:

• Instant vanilla pudding mix powder: Use the dry powder and adjust to taste.
• Vanilla buttercream with cornstarch: Mix powdered sugar, butter, vanilla, and a little cornstarch for body.
• Vanilla icing thickened with cornstarch: Whisk in small amounts until the filling holds its shape.

Substitutes may change the flavor and color slightly. Start with the same volume your recipe calls for, then tweak vanilla, sweetness, and thickness. Chill the pan thoroughly before adding the chocolate layer to help the bars slice neatly.

It’s a versatile dessert helper you can use in lots of ways:

• Pouring custard: Serve warm over cakes, puddings, or fruit crumbles.
• Layered desserts: Thicken to a spoonable set for trifles, parfaits, and pudding cups.
• Pastry fillings: Cook to a thicker consistency for tarts and cream-filled treats.
• Fruit sauces and pie fillings: Add a small amount for extra body and sheen.
• Flavor and color: Bring classic vanilla or fruit notes to homemade desserts.

Thickness depends on your powder-to-milk ratio and milk choice. For richer texture, use whole milk; for a lighter sauce, increase the milk slightly. Always follow the package directions for best results.

Here’s a general stovetop method that works for most mixes:

1. Check the package for exact ratios of powder, milk, and sugar.
2. Whisk the powder with a little cold milk to make a smooth slurry.
3. Warm the remaining milk with sugar over medium heat.
4. Slowly whisk in the slurry; stir constantly until it bubbles gently and thickens.
5. Simmer briefly, then remove from heat. Cover the surface to help prevent a skin.

For a thinner sauce, add a splash more milk; for a thicker set, use slightly more powder. Some products are instant and only need hot milk or water—follow the label. Results can vary with cookware and heat level, so adjust as you go.