INGREDIENTS
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2 tbsp. unsalted butter, plus more for baking dish
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1 head cauliflower, cut into florets (8 to 10 cups)
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3 tbsp. flour
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2 c. warm milk
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kosher salt
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Black pepper
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Pinch of ground nutmeg
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3/4 c. grated Gruyere, divided
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3/4 c. grated white Cheddar, divided
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4 slices bacon
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1/2 c. panko bread crumbs
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1/4 c. grated Parmesan
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2 tsp. fresh thyme
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2 tbsp. extra-virgin olive oil