Preheat the oven to 170 degrees. Take the butter and milk out of the refrigerator ahead of time. Prepare the paper cupcake pans on a baking sheet.
Dice the butter and mix until smooth. Then add the eggs and milk. Finally, add the baking flour and sugar and beat for 3 minutes until you have an even, fluffy batter.
Fill the molds to about 2/3 full and bake the cupcakes in the oven for about 20 minutes. Check with a skewer to see if they are done. If the skewer stays clean, then the cupcakes are done.
Let the cupcakes cool thoroughly before decorating further.