Golden Gratinéed Onion Soup

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Ingredients

2 tablespoons unsalted butter

3 tablespoons extra-virgin olive oil, plus more for brushing

3 pounds large yellow onions, halved lengthwise and thinly sliced crosswise

2 thyme sprigs

1/4 teaspoon salt

1 tablespoon all-purpose flour

6 cups chicken or beef stock or canned low-sodium broth

Freshly ground black pepper

12 baguette slices

1 1/2 cups shredded Gruyère cheese (6 ounces)

2 tablespoons grated Parmesan cheese

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