You can of course replace any ingredients (I.E Potato) and instead of frying up that you could fry up some bacon or/and onions and/or mushrooms types of things until you find your perfect frittata!How To Make It....Pre-heat your oven to 220??C / 425??F and then get onto the making which is so quick!Heat up the olive oil in a medium, (ovenproof) frying pan till gently sizzling.