Old-Fashioned Tuna Noodle Casserole
Laugh all you want at the crisps on top — then watch the dish come back scraped clean. Tuna noodle casserole is peak granny economics: two cans from the cupboard, a handful of noodles, and a topping made from the end of the crisp bag. It fed the street through the lean years, and it still beats most of what passes for comfort food.
The one crime against this casserole is wateriness, and it has three culprits granny knew by name: tuna that wasn't pressed properly dry, mushrooms that didn't cook long enough to shed their moisture, and noodles boiled to the packet time (they should come out 2 minutes early — the oven finishes them). Handle those three and it bakes up creamy, golden and crunch-topped, never soupy.
Serve it straight from the dish with peas on the side that nobody asked for and everybody eats.
Old-Fashioned Tuna Noodle Casserole
Creamy from-scratch sauce, egg noodles and tuna under the classic crushed-crisp top.
Ingredients
- 300 g egg noodles
- 50 g butter
- 1 onion, finely chopped
- 200 g mushrooms, sliced
- 40 g plain flour
- 600 ml milk, warmed
- 1 tsp Dijon & 100 g grated cheddar
- 280 g drained canned tuna (2 cans), pressed dry
- 150 g frozen peas
- 50 g plain crisps, crushed + 25 g buttered breadcrumbs
Method
- Noodles, underdone. Oven to 190°C (fan 170°C / gas 5). Boil the noodles 2 minutes short of packet time; drain well.
- Sauce. Cook the onion and mushrooms in the butter until the mushroom moisture is gone. Flour in for a minute, whisk in the warm milk, simmer to a coating sauce. Off the heat: mustard, cheddar, seasoning.
- Combine. Fold in the noodles, pressed-dry tuna and peas — slightly too saucy is exactly right.
- Top. Into a buttered dish; buttered crumbs first, crushed crisps over — the old-school top that bakes golden and stays crunchy.
- Bake. 20–25 minutes until bubbling and golden. Rest 5 minutes and bring the dish to the table.
Press the tuna in a sieve with the back of a spoon until it stops dripping — that half-minute is the difference between creamy and watery.
Tips for a never-watery bake
Press the tuna dry
Drained isn't dry. Press it in a sieve until nothing drips — then it's ready.
Cook mushrooms fully
Keep them in the pan until their water has cooked off and they start to brown.
Crisps at the end
The crushed-crisp top goes on just before baking — never onto a make-ahead dish.
Questions, answered
Why is my tuna casserole watery?
Three leaks: tuna not pressed dry, mushrooms not cooked until their moisture is gone, or noodles boiled to full time. Fix all three and it bakes creamy, never soupy.
Crisps on a casserole — really?
Really. Crushed plain salted crisps are the classic mid-century topping — golden, crunchy, and self-seasoning. The buttered breadcrumbs underneath anchor them.
Make ahead or freeze?
Assemble without the topping; fridge up to 24 hours, then top and bake +10 minutes. Freezes 2 months — add the crisps fresh, always.