There are several different methods. Here's how I do it:
Preheat oven to 400 degrees.
Melt a couple tbls of butter and a couple of olive oil in your skillet on med/high. Add any ingredients (onions, garlic, peppers) that need to be cooked and let them saute' until soft. Add other ingredients (your sausage, olives, sun-dried tomatoes, rice or pasta, and let them warm a bit. Mix your eggs (at least 6) with a little milk (about 1/4 cup per 4 eggs), then add cheese. Pour over sizzling mixture in pan. Let it cook a minute, then lift side of frittata,and tilt pan to let some the uncooked egg slide underneath, as you would with an omelet. Sprinkle some more cheese and a bit of paprika (if you have it) on top, and slide it in the oven. Some of your sliced olives and sun dried tomatoes would look pretty on top.
It's hard to tell you about the time. It should be browned and crisp on top and bottom, but semi-set inside. I usually end up turning on the broiler at the last minute.
Let it stand for 10 minutes after you take it out of the oven, to give it time to set up.
This stuff is great the next day, too. I like it cold right out of the fridge for a snack. HB heats his up in the nuke. Either way, it's awfully good.
*Note* To you gourmet chefs out there, feel free to offer your good advice. I just started making these about a year ago.
We get by with a little help from our friends