Best Tuna Noodle Casserole

By NicoleMcmom

5.0 / 5

20min

35min

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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