Preheat your oven to 180°C/360°F.
First, cream your butter and sugar.
Cream it VERRRRRRRRRY VERRRRRRRRRY WELL. Like reeaaaaaaaaally long. Maybe even 10-12 minutes. Until all the sugar is dissolved.
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This is how it should somehow look like.
Mix your egg with the yolk.
The add it to the butter mixture along with vanilla. I used vanilla bean extract which gives a deeper, more delicious vanilla flavor. Usual vanilla extract would work just fine as well. :)
Cream! For about another 5-7 minutes.
Then add your flour, baking powder and milk at the same time at low speed. Literally for just 10 seconds. It doesn't matter if its not fully incorporated.
Scrape down the sides of the bowl.
Fill it in a piping bag. (You could skip this and fill them with a cookie scoop or just tablespoons)
Ta da! Excuse my ugly dirty finger please. I was working with fondant. :/
Frost or decorate to your liking. Enjoy! :)