Roasted Mushroom and Caramelized Onion Tart

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"Serious question for you...are you team mushroom? I'm smitten with mushrooms - they really don't have a huge flavor but take on what you flavor them with."
-- @cosetteskitchen

A Note from Feedfeed

Savory mushrooms and sweet caramelized onions make the perfect pair in this flaky tart that's perfect for a special brunch or lunch.