1. Prep Components
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Cook noodles 1 minute less than package directs, drain
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SautÊ onion and mushrooms in butter until golden, add garlic
2. Make the Sauce
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Melt butter, whisk in flour to make a roux
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Gradually whisk in milk and broth until smooth
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Simmer until thickened, then stir in sour cream and seasonings
3. Assemble
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In greased 9×13″ dish, combine noodles, chicken, mushrooms, and sauce
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Mix topping ingredients and sprinkle evenly over casserole
4. Bake & Serve
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Bake at 375°F for 25-30 mins until bubbly and golden
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Let rest 5 mins before serving
đĄ Chef’s Secrets
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 For extra richness – swap ½ cup milk for heavy cream
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 Make ahead – refrigerate assembled casserole up to 24 hours (add 10 mins baking)
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 Freezer tip – freeze before baking (thaw overnight before cooking)
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 Crispier topping – broil last 2 minutes (watch carefully!)