Brown ground beef in skillet over medium to medium-high heat, stirring to crumble. Transfer browned beef to a bowl.
Melt butter the same skillet; add zucchini and saute until just slightly softened, about 5 minutes.
Return ground beef to skillet along with dried onions, water, Knorr(R) Rice SidesTM- Beef, chopped tomatoes, and Worcestershire sauce. Bring to a boil over high heat. Reduce heat to low; cover and cook for 7 minutes. Top with cheese. Let sit 5 minutes before serving.