1 n-count Muffins are small, round, sweet cakes, usually with fruit or bran inside. They are often eaten with butter for breakfast.
(AM)
...breakfasts of pancakes, blueberry muffins, eggs, and bacon.
2 n-count Muffins are small, flat, sweet bread rolls that you eat hot with butter.
(BRIT)
in AM, use English muffins