Preheat the oven to 180°C/350°F.Line muffin tin with cupcake cases and keep aside.
In a mixing bowl, add melted butter, sugar and cream them using a whisk until they turn creamy and smooth.
Add one egg at a time and using a whisk mix well, until it is completely combined. Then add vanilla extract and mix well. Scrap the sides and bottom using a spatula.
Now sift plain flour, baking powder and add salt. Slowly mix them well. Add the milk slowly and start mixing with the help of a whisk until it lump-free. Don't over mix.
Pour the batter into a lined muffin tin, filling ⅔ full. Bake in the centre of the oven at 180°C/350°F for 20 - 22 minutes, or until a toothpick inserted in the centre comes clean.
Cool the cupcakes in the tin for 5 minutes then remove to a wire rack to cool completely.
Once the cupcakes are completely cool down you can decorate them as you wish.