Put 2/3 of the dough in the bottom of the pan pressing it using the palm of your hand. Press the crumble to make it even and create a bit of a border.
In the next step we add the blueberry jam but really, every type of jam you like do the work.Spread the jam on top of the crumble; the amount can vary depending on what you prefer; I'm putting 250 g for a 10-inch pan.
At this point, we remove the ricotta from the fridge and pour it on top of the jam.Make it even using an offset spatula,and add the finishing touch by covering our cake with the rest of the crumble.
Bake at 350°F in a preheated oven for 40 minutes or until golden brown on top.Remove it from the oven and place it on a wire rack.Let it cool for 30 minutes, then gently remove the ring.
Ok, now we have to flip the crumb cake to remove the springform plate. It's a delicate operation but manageable if you follow my directions.Place a cake plate or flat surface on top and flip the cake upside down. Now, you can gently remove the springform plate.Then we place the cake plate back on top and flip it once more so the crumb topping faces up.
The last touch, we sprinkle some powdered sugar on top, and we are ready to try!