Not everybody is lucky enough to have tree-ripened oranges, courtesy of a going away present from good friends in Arizona, but you can make do.
I start with a big container (4 servings they way they call it) of Dannon's plain unsweetened Greek yogurt. Right now it's both best ( flavor, additives, protein and carb levels) and cheapest. And I have to watch the carbs, of course. Take one of those oranges and grate half the peel to add. Peel the rest and cut the slices, minus the rare seed, into pieces. A second orange can be added if your tastes and carb allowances allow. Add a rounded teaspoon of ground cinnamon, 1/4 cup craisins, and half a cup chopped walnuts or pecans. If you want it sweeter, add a rounded tablespoon stevia or sucralose (Splenda, etc.) A little goes a long way with those. Stir it all together and either eat immediately or set aside for up to a couple days and let the flavors blend. The craisins help absorb the extra liquid the yogurt weeps.
For me the one-orange version divides into two full meals, easily packed into a cooler for breakfast and lunch.