• Pre-heat oven to moderate (180 degrees celsius, fan-forced).
• Grease a slice tin (approx 26 x 16 cm) and line with baking paper, leaving excess on the sides to lift out slice once cooked.
• Crush weetbix into a bowl.
• Add remaining dry ingredients to bowl and stir to combine.
• Melt butter and add to dry ingredients. Mix well.
• Press mixture into slice tin with hands and even the top surface using the back of a spoon.
• Cook for 20 minutes.
• Start preparing the icing a few minutes before the slice is ready to be removed from the oven. This slice is iced while hot from the oven.

Icing

• Sift icing sugar and cocoa into a bowl.
• Add 2 tablespoons of the boiling water to the butter and allow butter to melt.
• Add melted butter mixture to icing sugar and mix well.
• Add enough of the remaining tablespoon of boiling water to ensure the icing is soft enough to spread. Spread the icing over the slice while still hot. Sprinkle with additional coconut if desired.
• Allow to cool completely before lifting from the tin using the baking paper and slicing into 24 pieces with a sharp knife.

Airfryer Method

• Using the 3.2L Kmart Air Fryer (or equivalent), use a circle of baking paper to line the basket so the paper reaches about one third to half way up the side of the basket.
  
• Make the slice base according to the instructions above and pour mixture into air fryer basket.
• Press down with your hands to make the base even and firm.
  
• Smooth out the base further using the back of a spoon.
  
• Cook in the air fryer at 155 degrees celsius for 20 minutes.
  
• Make up icing according to instructions above a few minutes before the base finishes cooking.
• Once base is cooked, remove basket and pour icing over base while still hot.
  
• Place basket on bench so that it can cool evenly.
  
• Allow to cool completely before lifting slice from basket, lifting gently around the sides until it comes out of the basket in one piece.
• Cut slice into pieces.