Step 1

Preheat a fan forced oven to 170C / 350F (190C / 375F for no fan). Spray the bottom of a 20cm x 20cm / 8 x 8-inch baking tin with oil spray and line with baking paper. Set aside.

Step 2

Add both flours, salt and baking powder to a large mixing bowl. Use a whisk to combine. Set aside.

Step 3

Place a heat proof bowl on top of a pot of gently simmering water, making sure the bottom of the bowl isn’t touching the water. Add the sugar, egg and egg yolk and whisk until the sugar has dissolved completely. Take off the heat and add the melted butter. Whisk to combine. Allow to cool for 10 minutes.

Step 4

Add the dry ingredients and half the Cadbury speckled eggs to the wet ingredients and use a spatula to combine until a dough forms.

Step 5

Transfer the dough into the baking tin and spread evenly. Bake for 15 minutes. Take out of the oven and carefully press in the remaining Cadbury speckled eggs. Bake for a further 10 minutes. Lift out of the baking tin and cool completely on a cooling rack. Use a large knife to slice into 9 pieces.