45 Comforting Casseroles to Beat the End of Summer Blues

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© Cooking On The Weekends

French Onion Mushroom Casserole

Cozy French onion soup becomes a cozy baked casserole with this elegant recipe that uses sweet and savory pearl onions, crimini mushrooms, baguette and Swiss cheese to get that perfect blend of flavors. Oh, and don't forget the red wine!