Rolled oats (old-fashioned) and quick oats are both made using a process that hull, cuts, steams, and then rolls the oats. Quick oats are rolled much thinner, which decreases the time needed to cook the oats. Nutritionally, both oats are similar, but quick oats have a mushier texture. While you can usually swap oats evenly in most recipes, a blend of rolled and quick oats will give you a lovely texture.