I added sausage (cooked of course), and everything I might otherwise put on a pizza - mushrooms, onions, black olives, pepperoni. I was out of peppers or they would have gone in there too. The pepperoni is on top because our nine year old says he doesn't like it, so this way it was easy to see which section was his. (He says that, but then the next day wanted to make a grilled cheese using pepperoni and mozzerella. yeah.) Next time the pepperoni is going inside the crust. I didn't care for how it dried up and fell off the top.
I added a can of tomatoes (I think I used whole tomatoes, but anything would work) and sprinkled in some oregano and Italian seasoning. The recipe called for mozzerella and cream cheese, blended together, and if I had read it more carefully I was supposed to mix it in with the hot sausage to make it melt together. I didn't read it carefully though. I thought it was fine this way, but I could see that it would be much better all mixed in.