Place potato in colander. Sprinkle with salt and let sit 10 min. Squeeze out excess water. Combine wiht egg and onion. Pat into w ell-greased 23 cm pie pan, building up sides with floured fingers. Bake 40-45 min. at 200ºC , till browned. Spray with cooking oil spray after half hour.
Saute onions and garlic in butter 5 min. Add herbs and cauliflower and cook 10 min., stirring occasionally. Spread half of cheese i nto crust, then veggies, then remaining cheese. Combine eggs and milk and pour over. Sprinkle with paprika. Bake 35-40 min. at 200ºC till set.