Slow Cooker French Onion Soup
Ingredients:
4 large onions, sliced
2 tablespoons butter
1 teaspoon sugar
2 quarts beef broth, no sodium added
¼ cup sherry
2 sprigs fresh thyme
1½ teaspoons salt
Pepper to taste
Sliced bread of choice (or croutons)
8 ounces Gruyere cheese, sliced (can substitute with Swiss)