Place the baking tray and cooling rack with the oranges on top in the centre of the oven. Bake for 90 – 120 minutes (dependant upon their thickness) to allow them to slowly dry out. Check them after 90 minutes. Remove from the oven when they’re dry and crisp. Set aside to cool.

Increase the oven temperature to 190℃ (170℃ fan)/375°F/gas mark 5. Place the muffin sized cases into the muffin tray. Break the milk chocolate into small pieces and place into a heatproof glass bowl. Create a bain marie by positioning the bowl over a pan of water, ensuring the water doesn’t touch the base of the pan. Allow the chocolate to melt, stirring periodically with a spatula. Remove the bowl from the pan when it has almost finished melting (the residual heat will allow it to melt completely). Set aside allowing it to cool slightly

Beat the butter and sugar until very pale and fluffy. Add the orange extract and beat again to combine. Gradually add the beaten eggs a little at a time, beating well after each addition.

Sieve the flour, cocoa powder and baking powder into the mixture. Use a spatula or large metal spoon to fold this in gently. Add the milk and combine – you’re aiming for a nice dropping consistency. Then stir in the melted milk chocolate until just combined.

Fill the muffin cases about half to two-thirds full. Place the muffin tray in the centre of the oven and bake for 20 – 23 minutes. You may need to rotate the tray after 15 minutes of baking. Once baked, remove from the oven and transfer to a cooling rack to cool.

Break the dark chocolate into small pieces and melt in the same way you melted the milk chocolate

Beat the butter until it is soft and creamy. Sieve half of the icing sugar into the butter. Use a wooden spoon to combine the two ingredients. Sieve the remaining icing sugar into the bowl and mix until combined.  Beat well.  Add a little milk a teaspoon at a time and beat to create a creamy frosting. Add 1tsp of orange extract and mix to combine. Then add the melted chocolate and beat until combined.  Taste.  Add a little more orange extract as required, and mix to combine.

Spoon the chocolate buttercream into a piping bag fitted with a large star nozzle. It’s easier to pipe if it’s only half full (re-fill the bag when required).  Pipe a generous swirl of the buttercream frosting over the cupcake sponge. Position a slice orange into the frosting. Finish with some sprinkles (optional).