OK, I get it now. You can put too much of that angel food batter into the 4X9 inch pan and when you do that, it blows over the top and burns on the upper heating unit. It also spills onto the pizza ceramic and the sides of the oven and the grate and everywhere else it can fall. Then it smokes. And it's ugly. But it tastes good and that's what I'm banking on as I put together the lemon glaze for this two-part disaster. I do cakes, but I obviously don't do them very well.