Broccoli Gratin
Ingredients:
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1 large head broccoli, cut into florets
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6 tablespoons butter, divided
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½ cup all-purpose flour
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1 ½ cups milk
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1 ½ cups shredded Cheddar cheese
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½ teaspoon salt, or to taste
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½ teaspoon ground black pepper
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1 pinch garlic powder
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1 pinch onion powder
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2 slices stale bread