Slow Cooker French Onion Soup

"A super easy version of french onion soup made in a slow cooker! Sweet caramelized onions in a tasty broth topped with toast and plenty of melted cheese! Yum!..."

INGREDIENTS
3 pounds onions, sliced
3 tablespoons butter
salt and pepper to taste
6 cups beef broth (or vegetable broth)
1 teaspoon fresh thyme, chopped (or 1/2 teaspoon dried thyme)
1 tablespoon balsamic vinegar
2 teaspoons Worcestershire sauce
8 slices baguette, toasted
1 cup gruyere, grated
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