Remove the skin and seeds from the sweet pumpkin, then steam it.
Mash the steamed pumpkin and let it cool.
In a bowl, combine the mashed pumpkin, egg, milk, whole wheat flour, baking powder, and olive oil. Mix well.
Pour the batter into a cake mold and spread it evenly.
Mix the crumble ingredients (almond flour, oats, olive oil, a small amount of sugar substitute) and sprinkle over the batter.
Bake in a preheated oven at 180°C for 25-30 minutes.
Let it cool, then cut into pieces to serve.