* Quick-cooking oats are the same as old-fashioned oats but they are coarsely chopped so that they cook faster. If you only have old-fashioned oats, you can give them a quick whir in the food processor to make quick-cooking oats. Use about 1 ¾ cup old-fashioned oats to yield 1 ½ cups quick-cooking oats. Alternatively, you can use old-fashioned oats in this recipe but the muffins will have a chewier texture.