Best Tuna Noodle Casserole
Ingredients:
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1 (12 ounce) package egg noodles
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4 ¼ teaspoons kosher salt, divided
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4 tablespoons salted butter, divided
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5 teaspoons olive oil, divided
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1 (8 ounce) package sliced fresh mushrooms
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1 small white onion, minced
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¼ cup all-purpose flour
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2 cups milk
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1 ½ cups chicken stock
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2 tablespoons lemon juice
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1 teaspoon Dijon mustard
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½ teaspoon ground black pepper
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1 ½ cups shredded white Cheddar cheese
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1 cup frozen sweet peas
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2 (6 ounce) cans tuna, drained
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1 cup panko bread crumbs
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¼ teaspoon ground paprika
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2 tablespoons finely chopped fresh parsley