Melt butter in medium saucepan. Add onions and cook over medium-high heat, stirring constantly, until tender. In a medium bowl, combine onion, cheese, mayonnaise, hot sauce, and garlic; stir well. Pour into a small sized lightly buttered casserole dish. Bake, uncovered at 375 degrees for 20-25 minutes or until bubbly and golden.

Serve dip with tortilla chips or assorted crackers.