Best Tuna Noodle Casserole

Details

Ingredients

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