Macaroni cheese with bacon, fried onion, fried garlic, fried mushrooms, frozen peas, raw peppers and courgettes added to pasta water for the last 5 minutes - I do a massive pot of that, DD and DH eat loads and I freeze the leftovers which I then reheat, with a good handful of cheese chucked over the top, as a pasta bake. That works well.
Curries with coconut milk rather than tomato based? I'm not sure about freezing though.
Smoked fish and broccoli pie - poach the fish in milk first and use that milk to make your white sauce, top with mashed potato and a layer of breadcrumbs and/or handful of strong cheddar on top - freezes well too, before or after the baking.
Although it doesn't make 2+ dinners, a very FAST dinner would be to cook pasta. In a separate pan, fry bacon and onion, perhaps mushrooms. In a jug, combine 1/2 eggs and a good dollop of double cream, season well with pepper and grated parmesan (no salt - bacon is usually enough), keep some of the pasta water when draining. Put hot pasta back in the pot, throw the fried bits in, then the "sauce" from the jug and stir quickly - it will need a few tablespoons of pasta water to help prevent curdling of the eggs and make it silky smooth - it shouldn't need to go back on the stove, but perhaps for just 30s to fully cook the eggs, while stirring constantly and preventing curdling/scrambled eggs.
Or fry an onion, chicken pieces, mushrooms if desired. Add a glug of white wine, condense it a little, add a glug of chicken stock, condense a little, add a dash of cream. Serve over fresh pasta or rice.
I lived on boiled carrots, boiled potatoes and plain grilled chops for about 4 months when DD was small for similar reasons.