Beat butter lightly, add sugar, beat again until fluffy, add 1 egg each, beat.
Separately mix flour, salt and baking powder, add to the butter mass, mix.
Add diced chocolate, mix. With the help of two tablespoons, spread on a baking sheet covered with parchment, at a distance of 4-5 cm from each other (they increase greatly in volume).
Bake in an oven preheated to 190 degrees for 10 minutes. Remove, cool on a baking sheet.