INGREDIENTS
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kosher salt
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1 lb. penne
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3 tbsp. unsalted butter
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3 tbsp. all-purpose flour
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1/4 c. tomato paste
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2 c. whole milk
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1 tsp. dried oregano, plus more for garnish
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1/2 tsp. crushed red pepper flakes
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3 c. grated mozzarella
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1/4 lb. mini pepperoni slices