Preheat the oven to 200C (this is as high as my oven will go – I am really sorry that I cannot be more precise on temperatures).
Leave potatoes unpeeled, or peel if you prefer. Grate the potatoes on top of a clean, medium to large size dishcloth. Wrap and squeeze the grated potatoes so that the juice seeps out of the cloth. Squeeze until you can’t any longer and you feel that most of the juices are gone. Place the contents into a large bowl.
Add the seasonings, eggs, and flour (I also added a few teaspoons of cornstarch, which you can do if you like). A few big pinches of each ingredient, more or less depending on preference for taste, does the trick. Add the flour by the heaping spoonful – not too much to begin with. Stir in flour until the contents thicken and can be molded into shape. It should not be pasty, but just dense enough.
To make the filling, combine the ricotta, cream cheese, remaining cheeses, eggs, greens, herbs, & vegetables. You can leave plain, or lightly season with salt and pepper. I chose to keep mine unseasoned.
Using a cake mold, a springform, or pie tin, grease the container or line with baking paper. Pour in the potatoes. With your fingers, a spatula or the back of a spoon, shape the grated potatoes into a crust, molding it up the sides of the form and pressing it firmly all around. It’s likely that there will be some liquids that will still seep out, so place the container in the fridge. After about 10 minutes, take the form out of the fridge and pat dry. I did this twice until it remained dry. If no liquids seeped through the first time around, you’re good to go. This is important to do so that the contents do not steam.
Move the crust to the oven. Check after about 5 minutes whether the crust is firm to the touch. The crust should not be turning color – you just want it firmed.
Remove the crust from the oven and pour in the filling, making sure it’s leveled. You can choose to top with a few extra sprinkles of cheese, onion, or greens, or leave it as is. Personally, I will choose to sprinkle with extra cheddar the next time.
Cover the crust with aluminum foil and bake until the middle sets and the tops start to become golden brown. Then remove the foil from the crust and bake until a preferred golden.
Remove, let set, and slice to serve. Optional, to serve with sour cream.