01 -
Preheat oven to 375°F and position the rack in the top third of the oven.
02 -
Microwave butter in a small bowl and set aside. Chop onion and celery, and mince garlic. Soften cream cheese if needed.
03 -
Cook egg noodles for 2 minutes less than the package instructions indicate. Drain and transfer to a 9x13 casserole dish.
04 -
In a skillet, warm olive oil over medium-high heat. Add onion and celery, cooking for 5 minutes. Stir in garlic and cook for 30 seconds.
05 -
Transfer the cooked vegetables and garlic to the casserole dish with the noodles.
06 -
In the same skillet over medium heat, combine cream cheese, heavy cream, chicken broth, Dijon mustard, Worcestershire sauce, and salt and pepper. Stir constantly until the cream cheese melts and forms a smooth sauce, approximately 5 minutes. The sauce should have an Alfredo-like consistency and should not become overly thick. If needed, add a splash of cream.
07 -
Turn off the heat and stir in cheddar and Parmesan cheeses until melted.
08 -
Add frozen peas and flaked tuna to the sauce. Pour the combination over the noodles, tossing them to coat evenly, ensuring an even layer in the casserole dish.
09 -
Mix crushed Ritz crackers or breadcrumbs with melted butter, combining well.
10 -
Spread the buttery cracker topping over the casserole and bake uncovered for 20 minutes.