Go Back
Polka Dot Slice recipe from Baking with Granny. Easy tray bake cake for kids, made with coconut and rainbow chocolate drops (such as Smarties or M&Ms).

Polka Dot Slice

Easy and delicious tray bake, made with rainbow chocolate drops, coconut and vanilla. A family favourite but particularly loved by kids!
4.8 from 4 votes
PRINT RECIPE
Course: Dessert, Snack
Cuisine: British, Scottish
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 12 slices

INGREDIENTS
 

INSTRUCTIONS

  • Preheat your oven to 180°c (160°c for fan-assisted ovens, Gas Mark 4 or 350°F). Grease and line a 28×18cm (11×7 inch) baking tin with greaseproof paper. Set aside.
  • In a large bowl, cream together the butter/margarine and sugar until light and fluffy. Mix the eggs one at a time, mixing through before adding the next. Add the milk and vanilla extract. Mix through to combine.
  • Add the coconut and mix through until combined.
  • Sift in the flour, then fold together to create a batter.
  • Add the majority of the Smarties/M&Ms, holding back some (to top the Polka Dot Slice before baking). Mix through until evenly distributed in the batter mixture.
  • Spoon the mixture into your pre-lined tray, spreading evenly to the edges. Top the cake with the remaining Smarties/M&Ms. Bake in your preheated oven for 20-30 minutes, until golden in colour and a skewer inserted into the middle comes out clean.
  • Allow your Polka Dot Slice to cool for a few minutes before sprinkling a little extra sugar over the top of it, while still warm. Once completely cool, remove from the tray and cut into individual portions.

IMPORTANT NOTE:

All my recipes are developed using a digital scale and the metric system (grams and millilitres). Cup measurements are available as a conversion but these, unfortunately, won't always be as accurate. For best results, I always recommend baking with a digital scale.

RECIPE NOTES:

Egg Size: When it comes to eggs, I always buy mixed-weight free-range eggs. Generally, egg size doesn't make a huge difference in most baking, unless you are using sizes that lean towards the extremes. If you're unsure which eggs to use, I recommend medium eggs in the UK, which are roughly equivalent to large eggs in the US. That's what this recipe has been tested with.
Self-raising Flour: Don't have self-raising flour? For this recipe, simply whisk together 140g (1 cup plus 1 teaspoon) plain flour and 2 teaspoons baking powder instead. If you bake regularly, you can also make a larger batch to keep in your baking cupboard. For full instructions, cup conversions and answers to common questions, see my Self-raising Flour Ingredient Guide.
Serving: 1slice | Calories: 221kcal | Carbohydrates: 24g | Protein: 3g | Fat: 13g | Saturated Fat: 9g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 0.3g | Cholesterol: 49mg | Sodium: 79mg | Potassium: 51mg | Fiber: 1g | Sugar: 14g | Vitamin A: 298IU | Vitamin C: 0.1mg | Calcium: 20mg | Iron: 0.5mg

Nutrition information is provided as a guide and is based on automatic calculations. Actual values may vary depending on the ingredients and brands used, how the recipe is prepared, and individual portion or serving sizes.

Tried this recipe?

Tag @bakingwithgranny or use the hashtag #bakingwithgranny!
Pin recipe for later
QR Code linking back to recipe