gently cook the onions in a skillet over low heat (like you would caramelized onions) until soft and golden.
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Ingredients:
stir in cheddar, parmesan, mayo, and sour cream (aka the best things in life when mixed together)
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Last:
top with crushed crackers, then bake until hot/bubbly/amazing.
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Make Ahead Tips:Make this entire casserole up to the last baking step and keep it in the freezer indefinitely or the fridge for 3 days.This is a GREAT make-ahead holiday side dish!
One More Thing:This does not taste like mayo. It tastes like creamy, jammy onions in the best possible way.If you've never hopped into the world of Southern-style casseroles, THIS IS YOUR MOMENT.Promise.