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Preheat oven to 425F
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Melt butter in a large Dutch oven over medium-high heat until the foaming subsides.
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Add onion and cook while stirring occasionally until lightly browned and soft (about 4 minutes).
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Add garlic, thyme, salt, and pepper. Cook for about another 30 seconds.
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Add potatoes, chicken broth, cream, and bay leaves. Bring to a simmer.
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Cover, reduce heat to medium-low, and simmer for about 10 minutes; discard bay leaves.
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Transfer the mixture to an 8"x8" baking dish and press into an even layer.
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Sprinkle the top evenly with cheese.
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Bake in oven about 15 minutes until the cream is bubbling around the edges and the top is golden brown.
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Let cool 10 minutes before serving.