I don't like quick/instant oats (texture is a bit wallpaper-pastey to me), but I make a big batch of steel cut oats Sunday night (on the stove now). 1c oats, 3c water, simmer ~35-40 minutes (I usually brown the oats in a little butter before adding the water, but not critical). Pour in container, toss in fridge. Smash with milk/raisins/brown sugar/flax seed/nuts/PB/etc in the morning and either microwave for a minute or throw in pannier and eat cold when I get to work. Repeat x4, then it's the weekend and time for far less healthy/quick breakfast.
Otherwise quick breakfast is usually yogurt/granola/fruit or toast/PB/jam/nutella, but I usually eat any of the above when I get to work, just a banana and 1/2c of coffee/milk before I ride in.