French Onion Mushroom Casserole Recipe

French Onion Mushroom Casserole Recipe was pinched from <a href="http://cookingontheweekends.com/2015/11/french-onion-mushroom-casserole-recipe/" target="_blank">cookingontheweekends.com.</a>

"Peeling pearl onions can be very easy if you follow this step-by-step photographic guide...."

INGREDIENTS
Olive oil for the pan
1 3/4-pounds pearl onions, peeled (here's How to Easily Peel Pearl Onions)
8-ounces washed and dried Crimini mushrooms, thinly sliced
1 1/2 tablespoons finely chopped, fresh thyme
2 cups beef broth
1/2 cup dry red wine
5 tablespoons unsalted, softened butter, divided
2 tablespoons all-purpose flour
1 (approximately 2-foot) thin French baguette
1 1/2 tablespoons minced garlic, divided
1 1/2 cups grated Swiss cheese, divided
sea salt and freshly ground black pepper
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