How do you feel about oatmeal? It's healthy and has much more potential for adding flavors to than most people ever consider. It's pretty neutral and makes a good canvas for other flavors.

For example, you can add cheese to make something like a healthier Mac and cheese. The starch makes it sort of creamy.

But you might want to upgrade from rolled oats to steel cut oats. You get much more "tooth" to your oatmeal and not just mush. Unless the mush is what you like. You can also use whole oats for even more "tooth".