I get you OP, it’s an adjustment just for one person isn’t it!
Over summer, a group of 12 friends got an Airbnb in Wales and we had a similar arrangement, taking it in turns to cook etc, with two veggies in the mix.
If it helps, some of the meals we made were:
Mac n Cheese, two were made side by side then separated into two large casserole dishes. one plain and one with chorizo in. Served with salad and garlic bread.
Home made pizzas. Someone was in charge of putting tomato sauce and mozzarella on and baking them, and then the other chefs that night added veg (peppers, mushrooms etc) to some, and veg and pepperoni/chicken to others.
Burgers, some beef and some halloumi, with all the sides (salad, chips, blue cheese, onion rings etc).
Spag bol, one with mince and one quorn mince.
For meals like the Mac n cheese and spag bol, it didn’t seem onerous having two separate ones on the go, as when you’re cooking for a large group you’d need two pans/two dishes full anyway.
Hope that gives some inspiration!