Use Hot Air for faster and more even multiple-rack cooking of pastries, cookies, muffins, biscuits, and breads of all kinds.
Bake cookies and biscuits on pans with no sides or very low sides to allow heated air to circulate around the food. Food baked on pans with a dark finish will cook faster.
Multiple oven rack cooking may slightly increase cook times for some foods.
Cakes, cookies and muffins have better results when using multiple racks.