I usually use a mixture of either green and red, or sometimes other colored bell peppers when I make them. Green peppers were on sale the other day, though, so I settled for just green peppers this time. I usually use a ground beef (or sometimes ground pork) and rice mixture, although at one point, I did try mixing the ground meat in with mashed potatoes, and that was pretty good, too. I made a batch the other day, but instead of using rice or mashed potatoes, I cooked up a batch of [URL='http://allrecipes.com/recipe/74749/fideo/']fideo[/URL] (with ground beef) adding in some Classico tomato sauce and Rotel, and stuffed the peppers with that instead. It came out yummy, so I wanted to share. After the peppers were stuffed, I just put them in the oven for an hour on 325.