Bring ¾ cup water to a boil. Add oats, stirring frequently until oats are cooked (about 8 minutes).
Meanwhile, melt butter in small pan and cook leeks, about 5-6 minutes.
Transfer oats to a bowl and top with leeks and feta.
In a separate pot, bring water to a boil and reduce heat. Crack an egg into a measuring cup (or other small dish) and slowly drop the egg into the water. Poach for 2½ minutes. Use slotted spoon to remove egg and place on top of oats. Salt and pepper to taste.
Recipe by Things I Made Today at https://www.thingsimadetoday.com/2013/02/13/steel-cut-oats-with-poached-egg-leeks-and-feta/