Scalloped Potatoes au Gratin

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1 tablespoon unsalted butter

1 yellow onion, finely chopped

2 cloves garlic, minced

1 1/2 cups heavy cream

1/2 cup low-sodium chicken broth

2 teaspoons fresh thyme leaves

1 1/2 teaspoon kosher salt

1/2 teaspoon ground black pepper

2 pounds russet potatoes, peeled and sliced into 1/8-inch slices

1/2 cup shredded Cheddar

1/2 cup shredded gruyere cheese