Cream together butter and sugar in a bowl.
Add egg and vanilla extract and mix well.
Sift in cake flour, baking powder, and salt, then combine.
Add chocolate chips, marshmallows, and crushed graham crackers to the dough and mix.
Shape the dough into balls, then place them on a baking sheet.
Bake in a preheated oven at 180°C for 10-12 minutes.
Top the baked cookies with marshmallows and chocolate, then bake a little longer.