Remove the skin from the kabocha pumpkin, boil it, and mash it.
Drain the tofu and mash it finely.
In a bowl, combine the mashed kabocha pumpkin, tofu, egg whites, almond flour, and baking powder, and mix well.
Pour the batter into an oven-safe mold.
Bake in a preheated oven at 180°C (356°F) for 20–25 minutes.