This is a killer dip that I had this past weekend. It is fantastic with taco chips or pita chips or just plain bread or crackers!
Thaw spinach and squeeze out all water. Set aside. Saute onions in butter until translucent. Add spinach to pan and stir for a couple of minutes. Add soup and Cheez Whiz. Heat on low heat until thoroughly heated. Add mushroom pieces and heat again. Add garlic powder to taste. Serve warm with crackers or chips.