* Frozen spinach does not work well in this recipe. If it's all you have on hand, I suggest draining well after cooking and cooling. ** If you are gluten-sensitive, just be cautious when choosing an onion soup package. Some do contain gluten, although in my experience, most do not :) *** I typically serves this with tortilla chips, but it's just next level unreal when you go old school pumpernickel bowl (assuming gluten is your bud!). **** This dip is meant to be served chilled or room temperature. Don't be daring and try to serve it warm... you will end up with a warm mess of mayo (eww!).