1.Mix Flour, Garlic Powder, Salt, And Pepper Together In A Resealable Plastic Bag. Add Cubed Chicken To The Bag And Shake Until Well Coated. 2.Heat The Oil In A Large Skillet Over Medium Heat. Add The Chicken; Cook And Stir Until The Chicken Is No Longer Pink, About 5 Minutes. Stir In The Bell Pepper, Onion, Zucchini, Mushrooms, Chicken Broth, And Italian Dressing. Cover And Simmer Until Vegetables And Meat Are Tender, About 10 Minutes.