Have you tried steel cut oats? Sometimes also called "Irish oats", steel cut oats when cooked generally have a chewy, al dente texture and a nutty taste. They are oat groats, or oat kernels with no husk, that have been cut into smaller, coarse pieces using a steel blade. Size-wise, they remind me of tiny Acini di pepe pasta.
Like their cousins rolled and instant oats, steel cut oats are a blank canvas for adding different flavors and ingredients. You can cook steel cut oats longer to make them a little more softer and creamier, as I usually do, but don't expect them to fall apart and turn to mush as instant oats would when cooked. Of course, adding a pat of butter or a touch of cream when cooking would help add creaminess and richness, as well.