Add the onions, red peppers, and celery to a microwave-safe bowl. Cook vegetables in the microwave for 4 minutes, to soften.
Heat 1 teaspoon olive oil in a large nonstick pan or pot. Add chicken. Cook for 3 minutes. Turn over and continue to cook for 1-2 minutes. Stir often. When chicken is white inside, remove cooked chicken to a plate. Set aside.
Keep the chicken drippings in the large pan and heat 1 more teaspoon olive oil. Add cooked vegetables, garlic, and red pepper flakes. Cook stirring often, for 2 minutes. Stir in broth, rice vinegar, soy sauce, and corn. Bring to a boil. Stir in broccoli slaw or cabbage, shredded carrots, and ramen noodles (throw away the seasoning packet). Bring back to a boil and turn down to simmer. Continue to cook and stir often, separating the noodles as they cook with a fork. Cook for 3-4 minutes until ramen noodles are soft. Stir in cooked chicken and spinach. Continue to cook for 1 minute, until heated through.
To serve: remove the ramen noodles with a fork and divide among 8 servings. Pour broth, with vegetables and chicken, among each serving. Serve with a spoon and chopsticks, if desired. The extra servings freeze great.