In 2 to 3-quart saucepan over medium heat, melt butter. Add onion; saute 5 minutes. Add potatoes, water and bouillon cubes. Bring to boil, reduce heat, cover and cook until potatoes are just tender, about 15 minutes. Remove 1 cup of potato cubes with slotted spoon; set aside. Pour contents of saucepan into container of electric blender. Holding lid down tightly, blend until smooth; return to saucepan. Mix in reserved potatoes and broccoli. Over medium-low heat gradually add cheese, stirring until heated through and cheese is completely melted. Season with salt and pepper.
Tip: Reserve 2 or 3 florets with at least an inch of stock to garnish each serving of
soup with ?trees?.