Not quite tinned, but another Store cupboard dinner is mushroom risotto. Everything is long life ingredients (parmesan lasts ages in fridge!).
Fry an onion,
Add Arborio rice
Add stock made from either stock cubes or powdered stock (or rehydration water from mushrooms)
Add mushrooms that are either rehydrated from dried, or from a jar in oil
Stir through a handful of parmesan before serving
Basic tomato sauce:
Fry an onion
Add sliced/crushed garlic (or garlic paste from a tube/jar if your supplies of fresh are gone - garlic and ginger are the 2 spices I would get that way for storecupboard)
Add tinned tomatoes (I prefer plum tomatoes and chop them myself)
Add some tomato puree if you have it
Add a pinch of sugar if that's needed (due to tinned toms)
I like to add a splash of balsamic vinegar and slug of wine for flavor
Dried herbs (oregano, basil, thyme are all good, perhaps a pinch of rosemary), and salt/pepper
Good additions for a veggie sauce are jarred roasted peppers, jarred mushrooms, some rehydrated mushrooms (don't leave them in the water too long, let them absorb tomato liquid as well), and I remember having jarred courgettes one time.
Or roasted veggies from the freezer (I think I mentioned these on this or the "how to preserve veg" thread).
Or either some good sausages (chopped)/chicken/prawns etc from the freezer, bacon lardons fried up from fridge (lasts weeks and weeks), tinned clams work ok too, if you need meat/fish.
I completely forgot about veggie curries.
Tinned chickpeas, curry powder/paste, an onion, tin coconut milk.
Long life veg are good in that too for interest - butternut squash, pumpkin, carrots, even parsnips as part of a mix.
Cauliflower or brocolli (from fridge or frozen).