All you will need in terms of "equipment" is one large bowl, a mixing spoon, a baking tray, and baking paper. The dough does not contain any leavening agents; they are crispy on the outside and soft on the inside.
Leave the butter at room temperature to soften. Also, if you do not have salted butter, add a pinch of salt during mixing. Mix the softened butter with sugar.
After that, add the flour and mix again until you get a uniform mixture. Shape the dough into balls about five centimeters in diameter. Place them on a baking tray lined with baking paper.
Flatten the tops before baking so that the cookies bake evenly. Bake the cookies for 10 to 12 minutes at 175°C, until they are golden brown at the edges. Cool for five minutes in the tray, after which they are ready to enjoy.