what's a REALLY low calorie breakfast??

Eggs and fruit.

Considering you are currently 5'9" and at a healthy weight of 135, but trying to lose weight to 110 (which would be a BMI of 16.2 and underweight), I don't think you should be cutting any more calories from your breakfast.

How old are you?

Water

Then tone up by lifting weights and eating healthy. Not be losing weight. Dieting at your age should only be done by kids who are obese, for whom staying overweight would be more unhealthy than restricting calories.  That doesn't apply to you.

Egg Whites are actually much lower in cals than whole eggs.  I usually eat them with spinach and mushrooms with 2 tablespoons of cheese.  I also eat fiber one 80 cal with almond milk.  Most morning my cals are under 160, and I eat right.

Original Post by amethystgirl:

Then tone up by lifting weights and eating healthy. Not be losing weight. Dieting at your age should only be done by kids who are obese, for whom staying overweight would be more unhealthy than restricting calories.  That doesn't apply to you.

Agreed!

I went to a performing arts high school with a lot of ballet dancers who obsessed over every calorie they ate, even to the point of complaining about their late night "binge" on carrot sticks.  The ones who went on to dancing professionally were NOT the skinniest ones, but the ones who focussed on their dancing instead of their diet.  I can tell you from experience that today all of the ones who dieted would be much happier and healthier (and possibly more successful as dancers) if they had eaten more and worried less.  

That being said, a lot of the muesli and granola you buy at the grocery store tends to have lots of sugar and a fair amount of fat but not necessarily a lot of nutrients, I usually eat a 400 calorie breakfast but try to get in as many nutrients as possible - bran or whole grain cereal with no sugar added, low fat yogurt, skim milk, nuts or flax seeds, raisins and grapefruit or some other fruit.  Eggs and oatmeal are also excellent choices.

Quick oats (30g) cooked with 125 low fat milk with a dash of cinnamon, cardamom and saffaron.

That's only 150 cals, and super yummy!

I got a food processor for christmas and I blend apples, blueberries, raspberries, greens, kale, avocado, oranges, sprouts, yogurt, low sugar/calorie orange juice (Trop50), and almonds into this gross amalgam of applesauce-like stuff. It's an acquired taste but quick and easy to get down and carry with you.