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Grandma’s Chocolate Squares

Slices and Brownies· Sweet Recipes

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Grandma’s Chocolate Squares are a simple, old-fashioned slice packed with rich cocoa flavour and the lovely texture of coconut. Made with everyday pantry staples like flour, sugar, butter, and egg, they create a soft, chocolatey square that’s easy to make and perfect for sharing.

This recipe works so well because it keeps things simple while delivering a dependable homemade treat every time. They’re ideal for lunchboxes, afternoon tea, or keeping on hand when you want an easy chocolate bake.

Three pieces of Grandma's Chocolate Squares served on a plate.

The family memories behind Grandma’s Chocolate Squares

I was blessed to know my wonderful Grandma into my early 20’s until she passed. She was a busy wife to a sheep farmer, a mother to seven, a Grandma to 21 and by now would be a Great-Grandma to lots and lots of great grandchildren!

She was very special to me and some of the fondest memories I have of her are baking and preparing meals for her family and grandchildren and I am delighted to have many of her recipes, passed on by my Mum who was her eldest daughter.

Grandmas Chocolate Squares served on a two tier cake stand.

A few helpful baking conversions

I love seeing this recipe enjoyed all over the world, we are based in New Zealand but how could we have imagined that this Kiwi recipe would make its way around the globe.

We measure in cups, bake in celsius and our tins are in centimetres, but I have amended the original recipe below to include grams to make conversions easier. 

If you run into any baking issues along the way, my Common Baking Mistakes and How to Fix Them guide can be really helpful.

Pieces of Grandma's Chocolate Squares served on a plate.

Other classic favourite recipes to try

If you enjoy old-fashioned chocolate baking, here are a few other easy slices you might like to make at home:

Grandma’s Chocolate Squares Recipe

Chocolate Slice

Grandma's Chocolate Squares

Yield: 16
Prep Time: 15 minutes
Cook Time: 15 minutes
Total Time: 30 minutes

Grandma's Chocolate Squares are a soft, chocolatey slice made with simple pantry staples, creating an easy and reliable homemade treat perfect for sharing.

Ingredients

  • 115 grams Butter, room temperature
  • 1 Cup White Sugar, 220 grams
  • 1 Egg, medium
  • 1 Cup Plain White Flour, 150 grams
  • 1 teaspoon Baking Powder
  • 3 teaspoons Cocoa Powder
  • 1 Cup Coconut, 90 grams
  • 1 Cup Sultanas [Raisins], 130 grams
  • BASIC CHOCOLATE ICING
  • 1 1/2 Cups Icing Sugar, 210 grams
  • 1 Heaped Tablespoon Cocoa Powder
  • 1 teaspoon Melted Butter
  • 1/2 teaspoon Vanilla Essence
  • 1-2 Tablespoon Hot Water

Instructions

  1. Preheat Oven to 170ºC Bake, (335ºF)
  2. Prepare a 23cm slice tin with baking paper to make lifting it out easier later on - I like to spray mine with a little cooking spray.
  3. In a food mixer whip the butter and sugar together until pale and creamy, approx 4 minutes.
  4. Add egg to butter mixture and beat in well.
  5. Add flour, baking powder, cocoa, coconut and sultanas and mix until well combined.
  6. Pour into a prepared slice tin
  7. Bake for 25 minutes.
  8. You need to ice slice while still warm. To prepare the icing combine the sifted icing sugar and cocoa, then butter and vanilla in a medium bowl.
  9. Add the water a little at a time until you get the desired consistency. Once removed from oven spread the icing over the still warm (but not hot) slice until it is evenly covered, it will melt onto the slice so a little goes further.
  10. You can decorate with a sprinkling of coconut or chocolate hail if desired once iced.
  11. Remove slice from pan once cooled and cut into small squares. Store in an airtight container.
  12. Enjoy!
Nutrition Information
Yield 16 Serving Size 1
Amount Per Serving Calories 356Total Fat 11gSaturated Fat 8gUnsaturated Fat 3gCholesterol 28mgSodium 136mgCarbohydrates 63gFiber 2gSugar 47gProtein 3g

JustAMumNZ.com, occasionally offers nutritional information for recipes contained on this site. This information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although justamumnz.com attempts to provide accurate nutritional information, these figures are only estimates.

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© justamumnz
Cuisine: New Zealand / Category: Slices and Brownies
Grandmas Chocolate Squares served on a two tier cake stand.

I really hope you love these Grandma’s Chocolate Squares as much as we do. My mum has been making this slice for years, and it’s always been such a tasty, dependable favourite. It’s a simple slice to prepare and a great one to whip up quickly with basic pantry ingredients.

This is one of those wonderfully easy recipes that quickly becomes a family favourite for years to come, and one I know I’ll be making again and again.

If you give this recipe a go, I’d love to hear how it turned out for you in the comments. You can also leave a ⭐ rating in the recipe card above, it really helps others find and enjoy this recipe too.

You can also find me over on Facebook and Instagram for more baking and cooking inspiration, or join my newsletter to receive my latest recipes straight to your inbox.

Happy baking,
Anna x

Comments

  1. Anne says

    Is the oven temperature in your recipes fan forced or regular. Thank you, I enjoy your recipes.

    Reply

    • justamumnz says

      Hi, always standard bake unless I am using two trays then it will be fan forced. But never fan bake. Hope that’s helpful.

      Reply

  6. Joanne Jacobs says

    i JUST MADE THESE, AND JUST LOVE. hAD TO BAKE MUCH LONGER THAN 25. i COULD ADD A BIT MORE FLOUR?

    Reply

    • justamumnz says

      Hi, the recipe is correct. It will be soft when it comes out of the oven and firms upon standing and cooling, if you cook it too long it becomes hard and dry.

      Reply

  9. Nell says

    I am confused about size of pan what is it in inches and what is Sultanas and degrees to bake will 350 degree be ok looks delicious

    Reply

    • justamumnz says

      Likely easier and quicker to google these equivalents for your country when you find a recipe that needs converting. The cm to inches is 7 inches x 10 inches but a 9 inch pan will work. Sultanas are a dried grape, like raisins. And 170 degrees Celsius to Fahrenheit is 335F.

      Reply

    • justamumnz says

      Yes. Always better to freeze uniced as sometimes icing doesn’t thaw as well as if it’s fresh

      Reply

  11. Julie Broughton says

    Hi Anna, I have just made the ‘Grandma’s Chocolate Squares’ recipe and need to know if there should be some liquid added, as I found the mixture very dry and crumbly, and it would not hold together. [So I added a little milk] They are very yummy!!!

    Reply

  13. Sarah Gregory says

    Hi Anna
    Thanks for sharing this with us. When I looked at the pictures my mind was busy thinking of the different ways you could make this. Then I looked at the recipe, and discovered how easy and quick this would be to make. This would be great for school lunches- not that I am expecting much to be left over as homemade baking seems to disappear quite quickly in our house!

    Reply

  14. Cynthia Rennert says

    Hello Anna,
    This recipe looks so amazing and love the photos that accompany your blogg. Just lovely. I will have to try this recipe as soon as we have our house back. Will let you know how it turns out.

    xxx
    Cynthia Rennert

    Reply

  15. jocelyn says

    Yumm 🙂 Just taken the first lot out of the oven now and going to put more in soon…cant wait to test it lol…and the kids are ‘patiently’ waiting to try it too

    Reply

    • justamumnz says

      Awesome Jocelyn, thanks for letting me know, hope your kids enjoy it as much as mine! Licking the icing bowl always popular here! 🙂

      Reply

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