I know cereal is quick and easy, but smoothies can be too and they are all natural, no preservatives or artificial colors or any added sweeteners and yes, the kids will actually drink them, especially if you give it a snazzy name, like strawberry Hulk smoothie or Pinkie Pie smoothie.
Whatever you have to do, just get them to try it, after they try it just once, they will love it. My pickiest of picky eaters requests these every morning and he even knows about the spinach.
For this exact smoothie, I used..
1 banana, a handful of frozen strawberries, about 1/4 cup of almond milk, a spoonful of whole milk yogurt I found at Aldi and a few baby spinach leaves. Add all ingredients into a blender and blend well.
You can garnish with granola for a little crunch or serve it with a spoonful of fresh whipped cream (or cool whip, I'm not judging). Now, sit back and relax, you just fixed the kids a healthy breakfast.