If you do want to bake off the whole recipe in one go, use a quarter cup measuring cup to fill your standard pan. You’ll have some leftover batter, likely enough for 1 jumbo muffin or a few small muffins. Try to refrain from dividing that leftover batter among the filled cups — the muffins bake more evenly when they are not over filled, and you can always bake off the remaining batter in a greased or lined ramekin.