smoothies are the girls' breakfast of choice around here.
Greek yogurt, honey, and some fruit tossed in. We also do these as breakfast parfaits if no one wants to clean the blender!!
Tossing some nuts on top adds a little extra protein.
I'm a big believer in a substantial and healthy breakfast for kids. It gets their brains and metabolism going for the day.
We also like turkey sausage, granola cereals, and toast with peanut butter. The girls like the "nutty bread" which is really a whole grain bread with chunks of grains and nuts.
My boys love peanut butter and Nutella sandwiches (on whole wheat bread). It's not the best, but it does have lots of protein and doesn't have a lot of simple carbs. And the sugar in Nutella is regular sugar, not high-fructose corn syrup, so it is better than jelly (or at least that's what I tell myself to make myself feel better about the fact that my son eats these sandwiches twice a day!)
There have been studies that show that people who eat only one meal day will lose weight if they eat breakfast only, but gain weight if they eat dinner only. Not that preteen girls need to be worrying about weight issues, but it does show that metabolism gets going in the morning and it is better for your body to more in the morning and less in the evening.