Drain the boiled chickpeas.
Preheat the oven to 180°C.
Add lemon juice, lemon zest, boiled chickpeas, oat flour, baking powder, stevia, vanilla extract, and almond milk to the blender and blend until smooth.
Pour the batter into the baking tin.
Bake in the oven at 180°C for 25 minutes.
Let it cool and serve.