Preheat the oven to 180°C (160°C fan) or Gas Mark 4. Line a 12-hole cupcake tin with cupcake cases.
Cream the butter and sugar together in a large mixing bowl using a hand mixer or stand mixer on medium speed, until the mixture is light, pale, and fluffy (this should take about 3–4 minutes).
Add the eggs, one at a time, beating well after each addition. Then stir in the natural strawberry extract.
In a separate bowl, combine the self-raising flour and freeze dried strawberry powder. Gradually sift this into the wet mixture, folding it in gently using a spatula or wooden spoon to avoid knocking out too much air.
Add the milk one tablespoon at a time, just enough to loosen the batter to a soft, dropping consistency.
Spoon the mixture evenly between the 12 cupcake cases, they should be about two-thirds full.
Bake in the preheated oven for 18–20 minutes, or until the cupcakes are risen, golden, and a skewer inserted into the centre comes out clean.
Cool in the tin for 5 minutes, then transfer to a wire rack to cool completely before decorating.