Muffins are typically smaller in size compared to full cakes or pies for a few reasons. First, muffins are often designed to be individual portions, allowing for easy serving and portion control. The smaller size also allows for quicker and more even baking, as the center of a larger cake or pie would take longer to cook through. Additionally, muffins are often enjoyed as a grab-and-go breakfast or snack, so their smaller size makes them convenient for eating on the move.
If there were a muffin the size of a full cake or pie, it would essentially be a large baked item resembling a giant muffin. While there isn't a specific term for such a creation, it could be referred to as a "muffin cake" or a "muffin pie" to convey the combination of a muffin's texture and a cake or pie's overall concept. Ultimately, it would be a unique and indulgent treat that could be enjoyed in larger slices or portions.