What do you get when you melt together chocolate bars and mix them with Rice Krispies? These delicious, no-bake Mars Bar Squares, also known as Mars Bar Slice, are perfect for any occasion. Their gooey and crunchy texture topped with smooth milk chocolate makes them absolutely addictive. Whether you’re hosting a gathering, celebrating a birthday, or simply looking for a sweet treat to enjoy at home, these squares will surely impress your family and friends.
Why You’ll Love This Recipe
- Quick and Easy: With just 10 minutes of prep time, this recipe is simple enough for anyone to make.
- No-Bake Delight: Skip the oven! The Mars Bar Squares set perfectly at room temperature.
- Irresistible Flavor: The combination of melted chocolate and crispy rice cereal creates a uniquely satisfying taste.
- Perfect for Sharing: Cut into squares and serve at parties or potlucks; they’re always a hit!
- Customizable: Feel free to add nuts or different chocolate types for a personal touch.
Tools and Preparation
Before you get started on these delicious Mars Bar Squares, gather your tools. Having the right equipment will make the process smoother and more enjoyable.
Essential Tools and Equipment
- Non-stick baking pan (8×8 inches)
- Large saucepan
- Heatproof bowl
- Spatula
- Microwave or double boiler
Importance of Each Tool
- Non-stick baking pan: Ensures easy removal of the squares without sticking.
- Large saucepan: Allows for even melting of butter and chocolate without burning.
- Heatproof bowl: Ideal for melting chocolate safely in the microwave or over steam.
Ingredients
For the Base
- 1/2 cup unsalted butter (112 grams)
- 4 Mars bars (53 grams each) (chopped)
- 3 cups Rice Krispies (about 90 grams) (aka Rice Bubbles)
For the Topping
- 1 cup milk chocolate chips (about 200 grams) (or chopped milk chocolate)

How to Make Mars Bar Squares
Step 1: Prepare Your Pan
Lightly grease an 8×8 inch (20×20 cm) square baking pan to prevent sticking.
Step 2: Melt the Butter
Add the butter to a large saucepan. Gently melt it over low heat while stirring occasionally.
Step 3: Add Mars Bars
Once the butter is melted, add the chopped Mars bars. Stir continuously until they start to melt together.
Step 4: Ensure Smoothness
Continue stirring until you have a smooth mixture. If it begins to separate, take it off heat and whisk until combined smoothly.
Step 5: Mix in Rice Krispies
Turn off the burner. Stir in the Rice Krispies gently. For gooier squares, you can use only 2 1/2 cups instead of 3 cups.
Step 6: Press into Pan
Spoon the mixture into your prepared pan and press it down gently using a greased spatula or non-stick spray on your hands.
Step 7: Melt Chocolate for Topping
Place milk chocolate chips in a heatproof bowl. Microwave in intervals of 45 seconds, stirring between each until almost melted. Alternatively, use a double boiler method to melt slowly over low heat.
Step 8: Spread Chocolate and Set
Spread melted chocolate over the top of your base evenly. Let it sit for about 2 hours at room temperature until hardened before slicing into squares. To make slicing easier, score lightly on top with a knife when it’s about 80% set.
How to Serve Mars Bar Squares
Mars Bar Squares are a delightful treat that can be enjoyed in various ways. Whether you’re hosting a party or just indulging yourself, here are some creative serving suggestions to enhance your experience.
Individual Portions
- Serve each square on a small dessert plate for an elegant touch. This presentation makes them perfect for gatherings.
With Ice Cream
- Pair Mars Bar Squares with a scoop of vanilla or chocolate ice cream. The creamy texture complements the gooey bars beautifully.
As Party Favors
- Cut the squares into smaller pieces and package them in clear bags tied with ribbons. These make for charming party favors that your guests will love.
With Fresh Fruit
- Serve alongside fresh strawberries or raspberries. The tartness of the fruit balances the sweetness of the bars, creating a delightful contrast.
Dusted with Cocoa Powder
- Lightly dust the top of the squares with cocoa powder before serving. This adds a sophisticated touch and enhances the chocolate flavor.
How to Perfect Mars Bar Squares
To ensure your Mars Bar Squares turn out perfectly every time, follow these helpful tips.
- Use quality ingredients: High-quality Mars bars and chocolate chips will elevate the flavor of your treats significantly.
- Be patient when melting: Melt the butter and chocolate slowly to prevent burning. Stir constantly to achieve a smooth mixture.
- Adjust Rice Krispies: For gooier squares, use 2 1/2 cups of Rice Krispies instead of 3 cups. This slight adjustment can make a big difference in texture.
- Cool before slicing: Allow the chocolate topping to harden at room temperature before cutting into squares. This ensures clean edges when slicing.

Best Side Dishes for Mars Bar Squares
Serving Mars Bar Squares can be even more enjoyable with complementary side dishes. Here are some delicious options to consider.
- Fresh Berries: A mix of strawberries, blueberries, and raspberries adds freshness and balances out the sweetness.
- Whipped Cream: Light and airy whipped cream can be dolloped on top or served on the side for dipping.
- Chocolate Sauce: Drizzle warm chocolate sauce over Mars Bar Squares for an extra indulgent treat.
- Coffee: A hot cup of coffee pairs well with these sweet squares, providing a nice contrast in flavors.
- Nutty Granola: Serve alongside nutty granola for added crunch and nutrition that complements the soft texture of the bars.
- Caramel Sauce: A drizzle of caramel sauce adds another layer of flavor that pairs wonderfully with chocolate and marshmallow treats.
Common Mistakes to Avoid
Making Mars Bar Squares can be fun and easy, but there are common pitfalls that can ruin your treat. Here are some mistakes to watch out for:
- Not measuring ingredients correctly: Accurate measurements are crucial for the right texture. Use a kitchen scale for precision, especially with butter and chocolate.
- Overheating the mixture: Melting the Mars bars and butter too quickly can lead to separation. Always use low heat and stir constantly to create a smooth blend.
- Not greasing the pan properly: Skipping this step can make it hard to remove the squares later. Use non-stick spray or grease with butter to ensure easy lifting.
- Using stale Rice Krispies: Fresher Rice Krispies provide better crunch. Always check the expiration date before using them in your recipe.
- Ignoring cooling time: Rushing this process can lead to messy squares. Allow your Mars Bar Squares to cool completely at room temperature before slicing them.
Refrigerator Storage
- Store in an airtight container.
- Keep in the refrigerator for up to one week.
- Line the container with parchment paper for easy removal.
Freezing Mars Bar Squares
- Wrap each square individually in plastic wrap.
- Place wrapped squares in a freezer-safe bag or container.
- They can be frozen for up to three months.
Reheating Mars Bar Squares
- Oven: Preheat to 350°F (175°C) and warm for about 5-10 minutes until slightly softened, but not melted.
- Microwave: Heat on medium power for 15 seconds at a time until just warm; be careful not to melt.
- Stovetop: Place in a pan over low heat, stirring gently until warmed through; avoid overheating.

Frequently Asked Questions
Can I make Mars Bar Squares without rice krispies?
Yes, you can substitute with other cereals like Cornflakes or use crushed cookies for a different texture.
How do I know when my Mars Bar Squares are set?
They should be firm and the chocolate topping should feel solid but slightly soft to touch.
What is the best way to cut my Mars Bar Squares?
Use a sharp knife and run it under hot water before cutting. This helps achieve cleaner edges.
How can I customize my Mars Bar Squares?
You can add nuts, dried fruit, or even swap chocolate types (dark or white) for varied flavors.
Can I make these ahead of time?
Absolutely! They store well in the refrigerator or freezer, making them perfect for preparing in advance.
Final Thoughts
Mars Bar Squares are a delightful dessert that combines gooey chocolate with crunchy cereal for an irresistible treat. Their no-bake nature makes them easy and quick to prepare. Feel free to customize with your favorite ingredients or toppings—these squares offer endless possibilities! Enjoy making this delicious recipe today!

Mars Bar Squares
Indulge in the delightful taste of Mars Bar Squares, a quick and easy no-bake treat that combines the irresistible flavors of melted chocolate and crunchy Rice Krispies. Perfect for any occasion, these squares are a crowd-pleaser, whether you’re hosting a party or looking for a sweet snack at home.
- Total Time: 30 minute
- Yield: Makes approximately 16 servings 1x
Ingredients
- 1/2 cup unsalted butter (112 grams)
- 4 Mars bars (53 grams each), chopped
- 3 cups Rice Krispies (about 90 grams)
- 1 cup milk chocolate chips (about 200 grams)
Instructions
- Lightly grease an 8×8 inch baking pan.
- Melt butter in a large saucepan over low heat.
- Add chopped Mars bars and stir until melted and smooth.
- Gently mix in Rice Krispies until well combined.
- Press the mixture into the prepared pan evenly.
- Melt milk chocolate chips in a heatproof bowl using a microwave or double boiler.
- Spread the melted chocolate over the Rice Krispie mixture.
- Allow to set at room temperature for about 2 hours before slicing into squares.
- Prep Time: 10 minutes
- Cook Time: None
- Category: Dessert
- Method: No-Bake
- Cuisine: American
Nutrition
- Serving Size: 1 serving
- Calories: 210
- Sugar: 14g
- Sodium: 70mg
- Fat: 12g
- Saturated Fat: 7g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 24g
- Fiber: 0g
- Protein: 2g
- Cholesterol: 15mg
Keywords: For gooier squares, reduce Rice Krispies to 2 1/2 cups. Customize by adding nuts or using different chocolate types for topping.






