Grilled Pizza with Sausage, Onions and Peppers

links 6 oz cooked chicken sausage(s), cooked

Oregano, dried

Red onion(s), small

Pizza sauce or tomato sauce, store-bought

Pepper(s) cut into 1/4-inch-thick slices, small yellow

Tortilla(s), medium whole wheat

Mozzarella cheese, part-skim