Like this? This round was pizza bagels but concept is the same.
I would NOT recommend this in a top-loading electric kiln, way too dangerous IMO.
Heat up to around 900*, pizzas cook in just a few minutes like a wood pizza oven. Use clay pizza stones or a brand new kiln shelf w/o wash, definitely use heat resistant PPE. After the first time I singed my eyebrows getting too close I decided it was time to make a pizza peel, WAY safer
I wouldn't worry about any toxicity unless you exclusively cook all your meals in your kiln. We all likely breathe more harmful stuff just walking through the clay studio with a dirty floor, breathing in a big city, walking past an idling car in a parking lot, sitting in traffic, etc.