A cupcake (also British English: fairy cake; Hiberno English: bun; Australian English: fairy cake or patty cake) is a small cake designed to serve one person.
It may be baked in a small thin paper or aluminum cup.
As with larger cakes, icing and other cake decorations, such as candy, may be applied.
Cupcakes are usually baked in muffin tins.
These pans are most often made from metal, with or without a non-stick surface, and generally have six or twelve depressions or “cups”.
They may also be made from stoneware, silicone rubber, or other materials.
A standard size cup is 3 inches (76 mm) in diameter and holds about 4 ounces (110 g), although pans for both miniature and jumbo size cupcakes exist.
Specialty pans may offer many different sizes and shapes. (source)
So can hamsters eat cupcakes at all?
Unfortunately they can’t eat cupcakes. They are far too sweet for them to eat.
If they nibble at them they will be fine but they are not something to purposely be fed to a hamster.