Nanaimo Bars (Classic No-Bake Canadian Dessert)

Nanaimo bars are Canada’s most famous no-bake dessert, and one bite explains why. A chocolate, coconut, and graham crumb base holds a thick layer of sweet custard buttercream, and the whole thing is sealed under a thin, glossy chocolate top. There is no oven involved, just a saucepan, a bowl, and patience while the bars chill and set.

They are the kind of dessert that disappears fast at potlucks and holiday tables. Try them alongside Salted Caramel Apple Bars and Classic Tiramisu for a dessert spread with something for everyone.

Why This Recipe Works

• The base sets firm, not crumbly: Melted butter and a beaten egg bind the crumbs so the bars slice cleanly instead of falling apart.
• Custard powder gives the real flavor: It makes the middle layer taste like classic custard buttercream, not just sweetened butter.
• A thin chocolate top cracks cleanly: A little butter in the melted chocolate keeps the top from shattering when you cut it.
• Chilling does the work: Two hours in the fridge firms all three layers, so the bars hold their shape at room temperature for serving.

Ingredients

(full list in card)

• 1/2 cup (115 g) unsalted butter, melted
• 1/4 cup (50 g) granulated sugar
• 5 tablespoons (30 g) unsweetened cocoa powder
• 1 large egg, beaten
• 1 3/4 cups (175 g) graham cracker crumbs
• 1 cup (85 g) shredded sweetened coconut
• 1/2 cup (60 g) finely chopped walnuts (optional)
• 1/2 cup (115 g) unsalted butter, softened
• 2 tablespoons (30 ml) milk or cream
• 2 tablespoons (15 g) custard powder
• 2 cups (240 g) powdered sugar
• 4 oz (115 g) semisweet chocolate, chopped
• 2 teaspoons (10 g) unsalted butter

How to Make Nanaimo Bars

Step 1: Make the crumb base

Line an 8-inch (20 cm) square pan with parchment paper, leaving an overhang. Stir the melted butter, granulated sugar, cocoa, and beaten egg in a saucepan over low heat until smooth and slightly thickened, about 2 minutes. Remove from the heat and stir in the graham crumbs, coconut, and walnuts, if using. Press firmly and evenly into the pan and refrigerate for 15 minutes.

Step 2: Beat the custard filling

Beat the softened butter, milk, and custard powder until smooth. Add the powdered sugar gradually and beat until thick, pale, and spreadable. Spread evenly over the chilled base and refrigerate for 30 minutes, until the filling is firm to the touch.

Step 3: Add the chocolate top

Melt the chocolate with the 2 teaspoons of butter in short bursts in the microwave or over a pan of simmering water, stirring until smooth. Pour over the filling and tilt the pan to coat evenly.

Step 4: Chill and slice

Refrigerate for 2 hours, until fully set. Lift the slab out with the parchment overhang and cut into 16 bars with a sharp knife, wiping the blade clean between cuts for neat layers. Serve chilled or at cool room temperature.

Tips

• Press the base hard: Use the bottom of a measuring cup to compact the crumbs, or the bars will crumble when sliced.
• Do not skip the middle chill: Spreading chocolate over a soft filling drags the layers together and ruins the clean look.
• Score before fully set for perfect cuts: If your kitchen is warm, cut the bars after 1 hour of chilling, then return them to the fridge to finish setting.
• Keep the chocolate layer thin: More than a thin coating makes the top crack and overpowers the custard middle.

Storage

Refrigerate Nanaimo bars in an airtight container for up to 1 week, with parchment between layers. Freeze for up to 2 months; thaw in the fridge before serving. They are best served chilled or at cool room temperature, not warm, or the filling softens.

Frequently Asked Questions

Are Nanaimo bars baked?

No. The base is set with melted butter and egg warmed gently on the stovetop, and the whole dessert firms up in the fridge. That is what makes them a classic no-bake bar.

What is custard powder, and can I skip it?

Custard powder is a cornstarch-based mix that gives the middle layer its signature custard flavor and pale yellow color. If you cannot find it, use an equal amount of instant vanilla pudding mix, though the flavor will be slightly different.

Why did my chocolate top crack when I sliced it?

The top was probably too thick, or the bars were too cold. Add the butter to the melted chocolate as directed, keep the layer thin, and let the slab sit at room temperature for 10 minutes before cutting.

Can I make Nanaimo bars nut-free?

Yes. Leave out the walnuts entirely; the base still sets well with just graham crumbs and coconut. Check that your graham crackers are nut-free if allergies are a concern.

Photo Credits

"Nanaimo Bars, stacked" by Craig Dugas, CC BY-SA 2.0 — https://commons.wikimedia.org/wiki/File:Nanaimo_Bars,_stacked.jpg

"Nanaimo bar detail" by Joy, CC BY 2.0 — https://commons.wikimedia.org/wiki/File:Nanaimo_bar_detail.jpg