Like you l enjoy cooking and rarely buy pre-made sauces etc. I agree that thinking about 3x meals a day is draining, especially when you have complaints and whinging!
When my youngest DC was the same age of your baby, I did baby led weaning, so they ate what everyone else was having.
My eldest (nine years old) was and still is a little fussy (she has got better, the older she has got), so l know exactly what you mean about cooking several different dishes. Personally, she is so headstrong that she’d rather go hungry than eat something she didn’t want. I try to at the very least, have something on the plate that l know she’ll eat and also separate everything (so she can’t complain about one food touching another 🙄).
Like PP have said:
Breakfast: cereal/porridge/toast/fruit/yoghurt
Lunch: sandwiches, wraps, salads, stir fried noodles with vegetables, crudités and dips, crackers and cheese, omelette.
Dinner: I tend to make more than l need and have enough left over to either freeze or to create another meal for later in the week.
Bolognese:
Serving 1: have this with pasta and a side salad (make enough salad, so that you could eat it for lunch the next day)
Serving 2: Use the sauce and make a lasagna or pasta bake
Chilli:
Serving 1: serve with rice and salad
Serving 2: use the chilli and make into wraps or enchiladas or serve with a jacket potato or loaded fries/nachos or even potato skins
Stew/casserole
Serving 1: make it serve with potato’s
Serving 2: create a pie Or make and have it with dumplings
Use any left over rice and make fried rice or stuffed peppers
Use any left over pasta to make into a pasta salad for lunch
Hope that helps.