Dissolve Knorr® Chicken Bouillon Cube completely in hot water. (Heat mixture in microwave on HIGH at 10 second intervals if needed.) Combine with ground chicken in medium bowl; shape into 24 meatballs (mixture will be soft). Heat 1 tablespoon (15 mL) oil in 4 to 5-quart (4 to 5 L) pot over medium-high heat and lightly brown half of the meatballs, turning occasionally to brown all sides. Reduce heat to medium and cook, covered, shaking pot occasionally, until thoroughly cooked, about 4 minutes. Remove meatballs and set aside. Repeat with remaining meatballs; set aside.
Heat remaining 1 tablespoon (15 mL) oil in same pot over medium-high heat and cook carrots, celery and onion, stirring occasionally, until almost tender, about 5 minutes. Add water and bring to a boil over high heat. Stir in Knorr® Sidekicks® Chicken Pasta Side Dish and return to a boil. Reduce heat to medium and cook until pasta is tender, about 7 minutes. Stir in meatballs and spinach and cook until spinach is wilted, about 2 minutes.