Slow Cooker French Onion Soup

Slow Cooker French Onion Soup was pinched from <a href="https://damndelicious.net/2017/11/03/slow-cooker-french-onion-soup/" target="_blank" rel="noopener">damndelicious.net.</a>

"Did you know you can make French onion soup in the crockpot?! It’s ridiculously easy with basically no stirring and no work!..."

INGREDIENTS
3 pounds sweet onions, thinly sliced
3 tablespoons unsalted butter, melted
2 teaspoons brown sugar
Kosher salt and freshly ground black pepper, to taste
6 sprigs fresh thyme
1 bay leaf
6 cups beef stock
2 teaspoons sherry vinegar
1 (12-ounce) French baguette, sliced
1 cup shredded Gruyère cheese
1 cup shredded asiago cheese
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