"Large Flake Oats" is a Canajen thing; I wouldn't understand. But I
found the straight poop on Quaker Canada's Facebook page:
In Canada, we offer four different types of rolled oats or oatmeal;
Large Flake, Quick, One Minute and Instant (in the individual
packets). All varieties are 100% Whole Grain, meaning, all three
parts of the grain, the bran, the endosperm and the germ remain
intact.
Large Flake Oats are made by rolling the whole grain. Quick Oats are
made by cutting the grain in half, then rolling it. The flakes are
slightly smaller and thinner which allows them to cook more quickly.
One Minute Oats have been cut into smaller pieces and are rolled
thinner still, and cook very quickly. These products contain only
100% whole grain rolled oats, and have the same nutritional benefits.
Large Flake, Quick and One Minute oats would all be suitable for
baking.
Now, here in A-may-reeka, Quaker makes Old Fashioned Oats, as well as
1 Minute Oats. Old Fashioned Oats are whole oats. So why do whole
rolled oats take 15 minutes to cook in Canada but only 5 minutes south
of the border? I suspect the oats are rolled thinner here, so that the
boiling water penetrates the grain quicker.