- Preheat oven to 180°C and line a muffin tin with cupcake cases. 
- In a bowl, cream together the butter and sugar until pale and fluffy. 
- Add the eggs one at a time, then mix in the vanilla extract. 
- Fold in the flour, then gently stir in the confetti sprinkles. 
- Spoon the mixture into cupcake cases and bake for 18–20 minutes, until risen and golden. 
- While cooling, make the buttercream by beating the butter, icing sugar, and milk until smooth and fluffy. 
- Pipe or spread the buttercream onto the cooled cupcakes. 
- Finish with an extra scattering of confetti sprinkles for a festive touch.