Melt butter in large saucepan;saute garlic for 1 minute. Add tomatoes and cook 5 minutes.Stir in 1 cup water, tomato sauce,corn,cilantro,hot sauce and chilli powder. Bring to a boil high heat. Reduce heat; simmer 10 minutes. Spoon soup into serving bowls; Sprinkle with cheese. Also with avocado and fried onions if desired.