Start by preparing the filling by butter a pie form.
Spread evenly the barriers in the form.
Sprinkle the sugar and potato flour on top.
Start the oven at 175 degrees Celsius.
Time to make the pie crust by melting the butter in a sauce pan.
Add the flour, oatmeal, sugar, vanilla sugar, syrup, baking powder, salt, and the whip cream and stir it all well.
Spread it evenly over the berries.
Place the pie in the middle of the oven for 25 minutes.
Take out the pie and let it cool down.