Chocolate Mint Slice Bars

Name: Chocolate Mint Slice Bars
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Yield: 12 bars
Ingredients: 200g digestive biscuits, crushed; 100g unsalted butter, melted; 50g cocoa powder; 100g dark chocolate, melted; 200g powdered sugar; 60ml milk; 1 teaspoon peppermint extract; Green food coloring (optional)

Highlighted under: Whisk & Wonder

I absolutely love these Chocolate Mint Slice Bars! They are a delightful treat that combines the rich decadence of chocolate with a refreshing minty twist. The layers of chocolate and mint make it an irresistible dessert that's perfect for any occasion. Whenever I bake these bars, I can't help but sneak a piece (or two) before they cool completely. The balance of flavors is simply unmatched, and it has become a family favorite in my home. I can't wait to share this recipe with you, so you can enjoy them too!

Created by

Mia Jefferson

Last updated on 2026-01-06T00:49:18.453Z

When I first made these Chocolate Mint Slice Bars, I was surprised at how easy they were to prepare. The combination of buttery biscuit base and fluffy mint filling came together beautifully. I've found that using high-quality cocoa powder really enhances the chocolate flavor, which is the star of this dessert.

One of my favorite tips is to chill the bars in the fridge for at least an hour before slicing. This helps to set the filling and makes cutting clean, even squares much easier. Trust me, the wait is worth it when you finally take a bite!

        What You'll Love About These Bars
        Rich chocolate flavor paired with refreshing mint essence
Creamy filling that complements the crunch of the base
Quick to make and perfect for sharing at gatherings

      

Understanding the Chocolate and Mint Layers

The combination of chocolate and mint in these bars is not only delicious but also has a significant impact on the overall palate experience. Dark chocolate provides a rich, slightly bitter flavor that offsets the sweetness of the mint filling beautifully. The mint filling, made from powdered sugar and peppermint extract, adds a refreshing and bright note, making every bite feel light rather than overly indulgent. It's essential to choose good quality dark chocolate; the higher the cocoa content, the more pronounced the chocolate flavor will be.

The texture contrasts are equally important. The base is crunchy thanks to the crushed digestive biscuits, which complement the creamy, smooth mint filling. When constructing the bars, be sure to press the biscuit mixture firmly into the baking dish. This ensures a stable base that holds together when sliced. If it crumbles, it’s likely that the mixture wasn't compacted enough, so don't be shy about using some elbow grease!

Tips for Achieving the Perfect Setting

Timing is crucial for achieving the desired texture in these bars. After spreading the mint filling over the biscuit base, it’s important to refrigerate it for at least 30 minutes. This resting time allows the filling to firm up, making it easier to slice after the chocolate topping is added. Without this initial chill, the filling may ooze out when you cut the bars, ruining their appearance and structure.

When pouring the dark chocolate topping, ensure that it has cooled slightly but is still pourable. This prevents the mint layer from melting and helps maintain distinct layers. If you wish to add a twist, you could incorporate a sprinkle of sea salt over the chocolate before it sets, which adds a delightful contrast to the sweetness and further enhances the overall flavor profile.

Ingredients

Ingredients for Chocolate Mint Slice Bars

Base and Topping

200g digestive biscuits, crushed
100g unsalted butter, melted
50g cocoa powder
100g dark chocolate, melted

Mint Filling

200g powdered sugar
60ml milk
1 teaspoon peppermint extract
Green food coloring (optional)

Additional Ingredients

Instructions

Prepare the Base

In a bowl, mix crushed biscuits, melted butter, and cocoa powder until well combined. Press the mixture firmly into the bottom of a lined square baking dish. Bake in a preheated oven at 350°F (175°C) for 10 minutes, then let cool.

Make the Mint Filling

In a separate bowl, combine powdered sugar, milk, peppermint extract, and a few drops of green food coloring (if using). Mix until smooth and glossy.

Assemble the Bars

Spread the mint filling over the cooled biscuit base. Refrigerate for about 30 minutes until set.

Add the Chocolate Topping

Once the mint filling has set, pour the melted dark chocolate over the top, smoothing it out evenly. Return to the fridge for another 30 minutes.

Slice and Serve

Once fully set, cut into squares and serve. Enjoy your delicious Chocolate Mint Slice Bars!

Serving Suggestions

Pro Tips

For an added crunch, consider topping the chocolate layer with crushed peppermint candies before it sets.

Storage and Make-Ahead Tips

These Chocolate Mint Slice Bars are perfect for making ahead of time, as they can be stored in an airtight container in the refrigerator for up to a week. For longer storage, consider freezing them. Once fully set and sliced, place individual pieces in a freezer-safe container, separating layers with parchment paper to prevent sticking. They’ll stay fresh for up to three months; just allow them to thaw in the fridge before serving for the best texture consistency.

If you plan to serve these bars at a gathering, consider making them a day in advance. This not only gives the flavors some time to meld, but it also allows the bars to set adequately, making them firm and easier to handle. Just be sure to cut them into squares before refrigerating or freezing, as this can be more challenging once they have solidified.

Variations and Customizations

While the classic chocolate and mint duo is a crowd favorite, feel free to experiment with flavors! For a chocolate orange variation, swap the peppermint extract for orange extract in the filling. Drizzle the top with melted milk chocolate instead of dark to provide a sweeter finish. You can even top it with crushed candy or toasted nuts for added texture and flavor.

If you want to make these bars a bit healthier, consider using whole grain biscuits instead of regular digestive biscuits. This adds fiber to the base and can make the bars feel a tad more wholesome. Additionally, for a dairy-free option, substitute the butter with coconut oil and use dairy-free dark chocolate, ensuring a deliciously indulgent treat that accommodates various dietary needs.

Questions About Recipes

→ Can I substitute the biscuits?

Yes, you can use any type of sweet cracker or cookie that crushes easily.

→ How long can these bars be stored?

They can be stored in the fridge for up to a week, but they are best enjoyed fresh.

→ Can I use a different flavor instead of mint?

Absolutely! You can replace the peppermint extract with vanilla or any other flavor extract you enjoy.

→ Is it necessary to chill the bars?

Yes, chilling helps the filling set properly, which is essential for achieving the perfect texture.