Oatmeal: Milk

M is for Milk.
Obviously. Three choices here: cooked with milk, cooked with water and topped with milk (cereal style) or cooked with milk and topped with milk. More choices: cow's milk, almond milk, soy milk, rice milk or coconut milk.

M is for Molasses
Just don't add too much, it's nasty.

M is for Maple Syrup.
Everyone knows maple syrup goes well in oatmeal.

M is for Macadamia nuts.
Health-wise, these are possibly the worst nuts, taste-wise, one word: yum. Exotic reputation helps.