My first thoughts:
Daal - slow cooker or on the hob, so incredibly easy
Chicken and chickpea curry - we usually use thighs, often a shop-bought paste if in a hurry, a can of coconut milk and a tin of chickpeas
Frittata - great for using up stuff in the fridge
Roasted tomato soup - halved tomatoes and/or cherry toms and/or drained tinned plum toms olin a massive roasting tray with halved head of garlic, a halved onion and some celery sticks, then blended smooth with some stock
Rice pilaf - Nigel Slater's is popular here - very comforting and simple, good with e.g. grilled salmon as a side
Puff pastry tart - shop-bought sheet of pastry brushed with mustard, covered with grated gruyere or parm and then whatever sliced veg is in the fridge - usually tomatoes, courgettes, aubergines
Pulled pork - I mix up about a tbsp of black treacle with a good squirt of ketchup and cumin, smoked paprika, ground coriander, oregano, and some dark brown sugar. Slice the fat off a shoulder of pork and rub it with the mixture. Slow cooker for about 8hrs or low. We have it with soft white rolls, coleslaw, apple sauce, stuffing and salad.
Thai curry - I buy a big pot of paste from the Asian supermarket and mix some with a tin of coconut milk. Add sliced veg to a big pot (I like courgettes, carrots, peppers etc) and soften, then add spice paste/coconut mixture and simmer til cooked. I also buy big bags of frozen gyoza and add these towards the end. You can actually also do it all in a big roasting tin in the oven, covered.
My other top tips: the Rukmini Iyer roasting tin books are great for feeding a big family without too much faff.
I am also never without a massive batch of homemade concentrated tomato sauce, frozen in big ice cube trays in the freezer and decanted into ziplocks (and the same for homemade chicken stock).
Convenience-food-wise - frozen gyoza, frozen green beans, frozen spinach, tinned potatoes and tinned chickpeas, coconut milk, good curry pastes, frozen pitta, feta and halloumi. If I have all those things I can always make dinner!
I also always have wholemeal fusili, red lentils, orzo, pearl barley (good for adding to anything cooking with some liquid in a roasting tin), chopped toms obvs.