I also dig oatmeal for breakfast. But...I hate plain otmeal. I always put non-fat yogurt or cottage cheese in there, or no-sugar maple syrup, artificial sweetener, and either fruit (berries, peaches, kiwi, and apples are nice), or couple of tablespoons of unsweetened baking cocoa powder (15 calories per tablespoon, and 1/2 teaspoon has as much "chocolate" in it as a candy bar). The added protein from the yogurt or cottage cheese makes me feel full longer, and I think it allows me to work out longer.
If I wake up late, and am doing a ride that morning, I try to keep it really light, and find oatmeal to be too heavy. On such days, I usually just eat fresh fruit and non-fat cottage cheese. There is water in the fruit, and your body burns off the fructose quckly while you ride.