Incredibly delicious Mille-feuille cakes

Mille-feuille can be made like a cake, but it is better as pies, because cutting it is not very convenient. Millefeuille is fragile and breaks.
Ingredients for 18 cakes:
Yeast-free puff pastry - 500 g
For cream:
Curd cheese - 150 g
Butter - 80 g
Condensed milk - 100 g
For jam:
Frozen blueberries - 200 g
Sugar - 25 g
Corn starch - 15 g
Powdered sugar for sprinkling.