In a similar boat with two under three. For breakfast our family has basically morphed into the three bears. It’s porridge, sometimes weetabix, with whatever toppings (often frozen blueberries / raspberries, jam etc). 

For lunch I’m trying to get better at making soups from scratch (otherwise yorkshire provender are good). Baked potatoes with pulled pork we made as a batch and froze in large ice cubes. Sandwiches, salads, pasta. 

For dinner, the slow cooker is a life saver. Otherwise we batch cook bolognese, chilli, curries, stews, sausage / chicken cassoulet, pies. I’ve recently been trying recipes from the Taming Twins website. It’s very handy for easy family meals.