Let the butter thaw and soften, then cut into small pieces and beat until it forms peaks.

Add the egg to the butter mixture and mix well.

Sift the cake flour and salt together, then gradually add to the butter mixture, gently mixing until combined.

Stir in the chocolate chips until evenly distributed.

Divide the dough into small round balls, slightly flatten them, and place on a baking sheet.

Bake in the oven at 350°F (180°C) for 15-20 minutes, then remove from the oven.