Stoneware Wave Microwave Cooker Do you eat out more than you cook at home? What if you could make an omelet in less than 5 minutes or an apple pie in 3 minutes? Would that make you consider staying home instead of going out? The inner diameter measures 4.5 inches, with a 3.5 inch height and a 12 ounce capacity. The Stoneware Microwave Cooker is a ceramic stoneware bowl with a special domed lid that allows heat to be circulated, while the special chimney design allows steam to escape. This cooker has been designed for safe microwave use only. The hollow handle is one of my favorite features because it stays cool even after several minutes in the microwave.