Wash the kabocha squash thoroughly, remove the skin and seeds, then boil and mash it.
Mix the mashed kabocha with unsweetened yogurt and a sugar substitute.
Prepare espresso or strong coffee.
Dip whole wheat or low-sugar biscuits into the coffee and arrange them on the bottom of a dish.
Spread a layer of kabocha cream over the biscuits.
Repeat this process 2–3 times, then sprinkle cocoa powder on top for the final layer.
Refrigerate for at least 1 hour before serving chilled.