Start by pre-heating your oven to 180c/350f. Also add your cupcake cases into your cupcake tin, leave this aside.
In a large bowl, add the softened butter, oil, sugar and vanilla. Beat these together for 5 minutes until light and fluffy. If you are doing this by hand, just aggressively whisk for as long as you can.
Add 2 of the eggs into this, whisk until combined, then whisk in the remaining 2 eggs.
Now add the flour and milk and whisk just until you get a smooth batter.
Add this batter into your cupcake cases, you want them to be around ¾ of the way full.
Bake for around 25-30 minutes, or until a toothpick inserted into the centre comes out clean. Once baked, leave to cool completely.
Once they are cooled, you can decorate them. I just used a large star piping tip to pipe my buttercream onto them, then I added some sprinkles.
Now you can enjoy!
