I opted to use rolled oats for this zucchini oatmeal, but quick cooking oats or quick cooking steel cut oats would also work! You can also opt to use regular steel cut oats, but you should prepare yourself for about 30 minutes of stovetop cooking for them to cook through. Remember that steel cut oats (regular or quick cooking) will have more texture than rolled oats, so keep that in mind as you decide. I don't recommend instant oats here, as they just don't get the right consistency. Quick cooking oats only add about 3 minutes of kitchen time to your breakfast and will yield a more toothsome result.