I didn't want to use shrimp, so I cubed and sauteed two large chicken breasts, seasoned with salt, pepper, and Italian seasoning. I added that at the same time the recipe called to add the shrimp. I also loved another user's idea to use chopped bell pepper, so I used one yellow bell pepper and most of a pint of tomatoes that I had on hand. I used goat cheese instead of feta. Definitely use a 9x13 in casserole dish.