Preheat your oven to 180°C/350°F.
First, mix together butter and sugar.
Then add in egg and vanilla extract, mix!
Then add in flour, baking powder and salt. And you're done.
Using a small ice cream scoop, scoop out a portion and place it in a bowl of sugar. Roll it around and shape it into a ball on the palm of your hands.
Roll them all and then press them down slightly with two of your fingers. Bake for 14-18 minutes. Once they're done, let them cool on the baking sheet for 5 minutes.
Then transfer onto a cooling rack. You can see some of the sugar in the picture. It gives an awesome crunch to the cookies. Makes about 2 1/2 dozen cookies.