Preheat the oven to 180 C / 160 C fan / Gas 4. Place 8 to 12 paper cases into your cupcake tin depending on how small or large you want the cupcakes to be.
Sift the flour and cocoa into a bowl and put to one side. Using an electric whisk, cream sugar and butter together until light and fluffy. Gradually add the beaten eggs, milk, orange flavouring and 2 to 3 tablespoons chocolate chips with a little of the flour. Gently fold in the remainder of the flour until all the ingredients are combined.
Evenly distribute the mixture amongst the cake cases.
Bake until a skewer comes out clean, about 20 minutes. Place on a cooling rack. Decorate to taste.