Mom dumps 3 lbs of onions in slow cooker overnight, makes irresistible meal

Ingredients:

3 pounds yellow onions, thinly sliced

2 tablespoons unsalted butter, melted

2 tablespoons olive oil

¼ cup balsamic vinegar

2 sprigs fresh thyme

8 cups beef stock

1.5 cups shredded Gruyère cheese

Salt and pepper, to taste

Optional: ⅓ cup brandy

To serve: Crispy bread slices

Instructions:

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