Dd1 was underweight as a baby. This went on for years. We had appointments with all kinds of specialists, one doctor helpfully told us she wasn't growing very well because she wasn't eating and you need to eat to grow. This was a revelation to us, previous to that we'd been watering her every night

They could never find anything wrong. Forcing her to eat (and we did try it) was just stressful to us and her. In fact, in hindsight, I think focusing so much energy on what she was or was not eating was unhelpful.
She was always alert, on target in all other development stages, just small and with an even smaller appetite.
She's 11 now and I struggle to get her to stop eating. She eats anything she can get her hands on and loves cooking and baking.
Dd2, otoh, who ate very well as a baby and toddler (in fact I was told to stop feeding her) is a fussy wee thing these days, who'd rather play than eat and constantly 'forgets' that she is hungry.
I used jars for dd1. I was a single parent, struggling to make ends meet, I didn't have enough money to feed myself and cooking just for me when toast and a tin of soup was fine, seemed a waste. Jars were always on some kind of offer and were cheaper than buying food for me and leaving some for dd1.
With dd2 I was with ex and past caring about what they were/were not eating after all the trouble with dd1 and food, so she just got a bowl of what we were having plonked in front of her and that was that. Mostly she decorated her hair with it, but she got there in the end.
If your baby is otherwise alert and happy I'd just go with what you are doing. Perhaps try more real food, if you are cooking anyway. No need to blend it, but other than that, don't stress.