Lower your expectations. Perfection is not a realistic goal with children in the house. Simplify your meals . Some of the healthiest meals are the simplest meals. During the homeschool year, we keep breakfast simple, with cereal or oatmeal and toast.
Lunch is also simple, consisting of sandwiches or soup and fruit.
The children also make their own lunches. Paper plates are used for quick clean-ups. Dinners are kept simple on Mondays, Wednesdays, and Fridays. Many times the children help prepare these meals. I prepare something more elaborate on Tuesdays and Thursdays, but even then it's often something that I can put in the oven or on top of the stove earlier in the day and have ready for dinner without a lot of last minute preparation.