Packed with vitamins and flavor, this ABC soup is fun for the whole family--plus filling for a lunchbox thermos.
In a medium bowl, add flour and grill seasoning. Mix with a fork to combine. Add beef cubes and toss in flour to coat.
Heat a pan over medium and add olive oil. (If your slow-cooker has a heat save bottom, feel free to use this. An Instant Pot can be heated to Saute). Add beef and brown on all sides.
Transfer beef to slow cooker. Add all ingredients, except ABC noodles.
Cook on HIGH for 4 hours. If you're using an Instant Pot, use the SOUP setting.
Add noodles. Allow to cook for another 20 minutes, or until tender.
Optional: add additional chopped spinach in the end.