Chocolate Mint Nanaimo Bars

Name: Chocolate Mint Nanaimo Bars
Prep time: 35 min
Cook time: 60 min
Total time: 95 min
Cuisine: Canadian
Ingredients: 1 cup dark chocolate chips; 1/2 cup unsalted butter; 1 1/4 cups graham cracker crumbs; 1 cup sweetened coconut flakes; 1 1/2 cups powdered sugar, sifted; 1/4 cup unsalted butter, softened; 1 tablespoon cornstarch; 1 teaspoon pure peppermint extract; 2 tablespoons milk; 3 tablespoons unsalted butter; 1 teaspoon vanilla extract

Recipe by Sam Rivera · Updated December 2025

Home cooks adore these Chocolate Mint Nanaimo Bars for their no-bake ease and holiday-worthy elegance. With layers of rich dark chocolate, creamy peppermint filling, and a coconut crunchy base, they're a Canadian classic that feels indulgent yet effortless. Perfect for cookie swaps, gift-giving, or simply treating yourself, these bars balance cool mint and deep cocoa in every bite. Their cool, set texture and festive flair make them irresistible year-round.

What Makes This Recipe Special

The base is pressed firmly to create a sturdy foundation without baking-just chill and go.
Peppermint extract is added to the filling for a bold, candy-like mint flavor without artificial taste.
Cornstarch in the mint layer prevents graininess and gives a silky, spreadable texture.
The final chocolate layer is poured warm but sets firm, creating a glossy, snappy top that contrasts beautifully with the soft middle.

⏱ 95 mins

Canadian

Servings 4

Ingredients

1 cupdark chocolate chips

1/2 cupunsalted butter

1 1/4 cupsgraham cracker crumbs

1 cupsweetened coconut flakes

1 1/2 cupspowdered sugar, sifted

1/4 cupunsalted butter, softened

1 tablespooncornstarch

1 teaspoonpure peppermint extract

2 tablespoonsmilk

3 tablespoonsunsalted butter

1 teaspoonvanilla extract

Nutrition

694 caloriesCalories

Per serving · Values are estimates

Instructions

Lightly grease an 8×8 inch baking dish and set aside.

In a double boiler or heatproof bowl over simmering water, melt dark chocolate chips and 1/2 cup unsalted butter until smooth.

Remove from heat; stir in graham cracker crumbs and sweetened coconut flakes until well blended.

Press mixture firmly into the bottom of the prepared dish. Refrigerate for 30 minutes until set.

In a mixing bowl, combine powdered sugar, softened butter, cornstarch, peppermint extract, and milk. Beat until smooth and creamy.

Evenly spread the mint filling over the cooled base layer. Refrigerate for 30 minutes to firm up.

In a heatproof bowl over simmering water, melt dark chocolate chips (from base ingredient list, reserve for topping), 3 tablespoons unsalted butter, and vanilla extract until smooth. Do not overheat.

Spread the melted chocolate mixture evenly over the chilled mint layer.

Allow to cool for 15 minutes. Cut into squares and serve.

Essential Tips

Use quality peppermint extract

Avoid imitation extracts-they can taste bitter or chemical-like. Opt for 100% pure peppermint extract for a clean, refreshing mint flavor that shines. A little goes a long way, so add it gradually and taste as you go.

Press the base firmly

Use a flat-bottomed glass or measuring cup to press the coconut-graham mixture evenly into the dish. Uneven layers can lead to crumbly edges when cutting. Aim for about 1/4-inch thickness for best texture.

Chill layers thoroughly

Don't rush the chilling steps. Each layer needs to set fully before adding the next-about 30 minutes minimum. Faster chilling can trap moisture and make the layers gummy rather than firm.

Sift powdered sugar

Sifting removes lumps and aerates the sugar, ensuring a smooth, lump-free mint filling. Skip this step and you risk a gritty texture that's hard to spread evenly.

Use room-temperature butter

Cold butter won't cream properly with the sugar, leading to a dense, uneven filling. Let the butter sit out for 30-60 minutes before mixing, or soften it gently in a warm (not hot) water bath.

Smart Swaps & Variations

White Chocolate Topping Replace the dark chocolate top layer with melted white chocolate for a creamy, contrasting finish that highlights the mint layer.

Crushed Candy Canes Sprinkle crushed candy canes over the top layer before it sets for a festive holiday touch and added crunch.

Coffee-Infused Base Add 1 teaspoon instant coffee granules to the melted chocolate base for a mocha twist that deepens the flavor profile.

Dairy-Free Version Use dairy-free chocolate chips, coconut oil instead of butter, and plant-based milk to make these bars suitable for vegan or lactose-intolerant guests.

Spiced Mint Add a pinch of cayenne or a dash of cinnamon to the mint filling for a subtle warmth that pairs surprisingly well with the cool mint.

What to Serve With This

A steaming cup of peppermint hot chocolate or chai tea to enhance the minty notes.
Fresh raspberries or strawberries for a bright, tart contrast to the rich layers.
A sprinkle of sea salt or flaky salt on top just before serving to elevate the flavors.
Serve at holiday gatherings, cookie exchanges, or as a sophisticated after-dinner treat.

Storage & Reheating

Storage

Store the bars in an airtight container in the refrigerator for up to 5 days. They can also be frozen for up to 3 months-just thaw in the fridge overnight before serving.

Reheating

To restore a fresh-from-the-fridge texture, let bars sit at room temperature for 10-15 minutes before serving. Avoid microwaving, as it can melt the chocolate layers and make the filling greasy.

Expert Chef Tips

Use a microplane to zest a small amount of orange or lemon peel into the mint filling-it brightens the flavor and balances the sweetness without overpowering the mint.
For a cleaner cut, dip a sharp knife in hot water and wipe it dry between slices. This prevents the chocolate from tearing and gives professional-looking squares.
If the filling is too thick, add a teaspoon more milk-but only after mixing. Too much liquid can make the layer too soft and cause the base to absorb moisture over time.

Equipment You’ll Need

8x8-inch baking dish
Double boiler or heatproof bowl and saucepan
Electric mixer (hand or stand)
Microplane or fine grater (optional, for zest)
Sharp chef's knife or bench scraper

Nutritional Benefits

Each bar (assuming 16 servings) provides about 694 calories, primarily from healthy fats in coconut and cocoa, which support satiety.
Dark chocolate contains flavonoids with antioxidant properties, which may support heart health when consumed in moderation.
The coconut base provides medium-chain triglycerides (MCTs), a type of fat that's metabolized quickly for energy.
Using unsweetened coconut flakes reduces added sugar in the base layer compared to pre-sweetened varieties.

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Frequently Asked Questions

Can I use milk chocolate instead of dark chocolate?

Yes, but the flavor will be sweeter and less complex. Dark chocolate's bitterness balances the mint, so swap carefully. If using milk chocolate, reduce the powdered sugar in the mint layer by 2 tablespoons to account for the added sweetness.

Why did my layers separate or become soggy?

This usually happens if the layers aren't chilled long enough or if moisture gets trapped. Ensure each layer is completely set before adding the next, and avoid covering the bars while they're still warm or chilled.

Can I make these ahead of time?

Absolutely! These bars taste even better after 24 hours as the flavors meld. Assemble them up to 2 days ahead and store them refrigerated. They're a great make-ahead dessert for parties.

What's the best way to cut clean slices?

Use a sharp chef's knife dipped in hot water and wiped dry between cuts. Press down firmly and clean the knife between each slice to prevent dragging and tearing.

Can I use a different extract for the mint flavor?

Peppermint extract is ideal for authenticity, but you can use mint extract in a pinch. Avoid mint oil-it's too strong and can be overpowering. Start with half the amount and taste before adjusting.

Why is my mint layer too grainy?

Graininess usually comes from undissolved sugar or cold butter. Make sure to sift the powdered sugar and use room-temperature butter. Mixing on medium-high speed for 3-4 minutes ensures a smooth, creamy texture.

Can I skip the double boiler?

Yes, but use low heat to avoid burning the chocolate or butter. Microwave in 20-second bursts, stirring between each, or use a heatproof bowl over a saucepan of simmering water, ensuring the bowl doesn't touch the water.

What's the best way to layer the ingredients?

Press the base firmly and evenly, then chill thoroughly before adding the mint layer. Spread the mint filling smoothly with a spatula, and pour the final chocolate layer while warm to create a glossy, even top. Chill each layer before moving to the next.