No-Bake Mars Bar Rice Crispy Squares (Ready in 10 Minutes!)

These No-Bake Mars Bar Rice Crispy Squares are the ultimate quick treat when you're short on time but need something sweet, crunchy, and downright addictive. Made with melted chocolate bars, puffed rice, and a silky chocolate topping, these bars are gooey, chewy, and packed with nostalgic flavor. Whether you're whipping them up for a party, lunchbox treat, or late-night snack, this easy recipe delivers big results in under 10 minutes.

What Are Mars Bar Rice Crispy Squares?

Mars Bar Rice Crispy Squares are a simple no-bake dessert made by melting Mars chocolate bars with butter, mixing them with puffed rice cereal, and topping with a layer of milk chocolate. They're similar in texture to traditional Rice Krispie treats but have a deeper, caramel-chocolate flavor thanks to the nougat and caramel in Mars bars. Popular in the UK and Europe, they're a sweet and chewy twist on a classic cereal bar.

Why Everyone Will Love This Recipe

• No Baking Required: Perfect for warm days or when you don’t want to turn on the oven.
• Quick & Easy: From pan to fridge in under 10 minutes.
• Perfect for Kids: Fun to make together, and even more fun to eat!
• Crowd Favorite: Loved by both kids and adults — expect them to disappear fast.
• Customizable: Add mini marshmallows, caramel drizzle, or chopped nuts to make it your own.

Pro Tips for the Best Results

• Use fresh puffed rice for the best crunch—avoid stale cereal.
• Chop the Mars bars before melting to help them break down evenly.
• Line your pan with parchment paper for easy removal and clean slicing.
• Let the bars chill completely before cutting for neat, sharp squares.
• Store in the fridge if your kitchen is warm to prevent the chocolate topping from melting.

Frequently Asked Questions

Can I use Milky Way instead of Mars bars?

Yes! In the U.S., Milky Way bars are similar to Mars bars and work as a perfect substitute.

Can I add other ingredients?

Absolutely. Try mixing in mini marshmallows, coconut flakes, or crushed pretzels for extra texture and flavor.

Do these need to be refrigerated?

Yes, refrigerating helps the bars firm up and makes them easier to slice. Store them chilled for the best texture.

How long do they keep?

They'll stay fresh in the fridge for up to 5 days, stored in an airtight container.

Can I freeze Mars Bar squares?

Yes. Freeze in layers separated by parchment for up to 1 month. Thaw in the fridge before serving.

How to Store

Store the squares in an airtight container in the refrigerator for up to 5 days. For best texture, let them sit at room temperature for 10 minutes before serving.

How to Freeze

Freeze the bars (cut or whole) in a freezer-safe container with parchment between layers. Freeze for up to 1 month. Thaw in the refrigerator and enjoy chilled or slightly softened.

How to Make Mars and Puffed Rice Square

Start by melting the butter and chopped Mars bars together in a saucepan over low heat. Stir continuously until the mixture is smooth and fully combined don’t worry if some nougat flecks remain, they’ll melt in as it cools.

Place the puffed rice cereal in a large mixing bowl. Pour the melted Mars bar mixture over the rice and quickly mix to coat everything evenly. Act fast before it starts to set.

Line a square or rectangular pan with parchment paper and press the mixture into the base using a spatula or the back of a spoon. Flatten it evenly, pressing down slightly to compact.

Pour the melted milk chocolate over the top, spreading it out smoothly.

Place the pan in the refrigerator and chill for at least 1 hour, or until fully set.

Once firm, remove from the fridge, slice into squares, and enjoy!