Slice apples, soak in cold water for minutes, then soak in a lemon-lime carbonated soda (such as or sprite) for minutes. Divide into snack size portions and store in Ziploc bags in the fridge. The lemon-lime soda will keep the apples from browning.
Self-Serve Snacks. Organize "anytime" snacks so that kids can help themselves (when they are ready for the responsibility). Allowing options helps kids feel independent and in control. One less after-school battle?