Been there. I remember having this struggle when my children were younger... Then the next year it switched and they had to be on the bus by 12 ... First I would bring in a healthy morning snack that is filling and serve it around 9:30-9:45. I learned early on there is no point doing art and circle if you are not able to have snack or diapers and outdoor play etc.... I alternated art and circle times....one day art the next circle....when I can't fit it in... Also move art to the afternoons just before your afternoon snack.. As for meals sloppy joes in the crock pot on whole grain buns with veggies on the side....have sandwiches per made in the fridge and then your soup in the crock pot warm and ready to dish out.... Put a casserole in the oven before you go out to the bus a Mexican tamale casserole is popular hear ...as well as tuna noodle ...lasagna all can have veg on the side and be served in minutes.... Sometimes serving a veggie appetizer will help little ones on the edge...

Hope this helps.....