I did something similar and I posted some time ago pictures, here they are, I usually use zucchinnis or/and yellow squash and on this picture I even used sliced egg plant. You can also use bell peppers...

Slice zuccini and yellow squash on half, trim bottoms a little bit to get better stability, sprinkle over seasonings, pizza sauce, some salami if you like and you are not vegetarian and cheese on top. You will get delicious and healthy food, with the taste of pizza ;-)

Maybe I burn them a little bit, but I like stuff well done ;-)