Caramelized Onion, Mushroom & Gruyere Tartlets

Caramelized Onion, Mushroom &amp; Gruyere Tartlets was pinched from <a href="http://www.browneyedbaker.com/2011/02/02/caramelized-onion-mushroom-gruyere-tartlets/" target="_blank">www.browneyedbaker.com.</a>
INGREDIENTS
1 tablespoon olive oil 1 large yellow onion, thinly sliced 1 tablespoon unsalted butter 16 ounces white button mushrooms, thinly sliced 1 clove garlic, chopped ½ teaspoon dried thyme Salt and pepper, to taste ¼ cup white wine (can substitut
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