A muffin tin (muffin tray, popover tray, bun tray) is a mould in which muffins, cupcakes, Yorkshire puddings etc. are baked. A single cup within a regular muffin tin is 3 and 1/2 ounces and most often has room for 12 muffins, although tins holding 6, 8, 11, 24, and 35 muffins do exist. A single cup within a mini muffin tin is 2 and 1/8 ounces, and because these are more uncommon, there is no standard number of cups per tin. Mini muffin tins of 6, 12, and 24 cups per tin do exist. A single cup within a jumbo muffin tin is 8 and 3/16 ounces, and again because these are more uncommon, there is no standard number of cups per tin. Jumbo muffin tins of 4, 6, and 12 cups per tin do exist.
Muffin tins can be made out of aluminium, stainless steel, cast iron, or silicone. In addition, aluminium and stainless steel muffin tins may be coated with Teflon or other non-stick coatings.