Start with the vanilla cream. Add milk, granulated sweetener, stevia drops and liquid sweetener (if using) to a pot and bring to simmer.
Add a little cornstarch at a time, stirring constantly so that you don't get any lumps.
Keep on adding cornstarch until the cream starts to thickened.
Remove from the heat and keep stirring until the cream comes together. It should be thick but still pourable.
Preaheat the oven to 175 degrees Celsius.
Line a baking sheet with parchment paper.
Make the crumble by combining all the ingredients for the crumble in a bowl. Set aside.
Prepare the blueberries by combining all ingredients for the filling in a bowl. Set aside.
Make the crust by combining the ingredients for the crust in a bowl. Keep stirring/kneading until it turns into a dough.
Add the crust to the prepared sheet and make a thin layer using your hands and pressing the dough down on the parchment covered sheet.
Add vanilla cream on top of the crust.
Add blueberries on top of the vanilla cream.
Finish by topping the blueberries with the crumble.
Bake in the oven for 22-28 minutes, until the crumble is golden brown.