Preheat oven to 350 degrees F (175 degrees C).
Combine cream of celery soup
Cheddar cheese
milk
sour cream
mayonnaise
tuna
parsley
lemon juice
salt
and ground black pepper in a 9x5-inch loaf pan; stir until sauce is well mixed.
Toss the pasta into the sauce until thoroughly coated. Spread the bread crumbs over the top of the pasta mixture.
Bake in the preheated oven until bread crumbs are golden brown and sauce is bubbly
about 45 minutes.
Cook's Notes:
Cream of mushroom soup can be substituted for the cream of celery soup.
Cracker crumbs can be substituted for bread crumbs.
Add cheese on top in the last 15 minutes is desired.