I agree with many of the previous posts. You can get organic versions of cheerios as well (cascadian farms makes "purely o's" which are whole grains).
I also did the step of slowly puree-ing less and less so that the texture got chunkier over time. it's pretty easy to do this with sweet potatoes, carrots, butternut squash, parsnips (my son LOVES parsnips!). Then eventually I would just give him the FINELY diced steamed veggies to self-feed once he had the pincer grasp. also introduced peas at this stage, i'd just get the frozen organic ones and warm up a couple spoonfuls worth. we also did shredded cheddar cheese, moving up to finely diced chunks.
for many months, breakfast every day was 1/2 a banana mashed up some, with some infant oatmeal mixed in (to add iron, whole grains, fiber) and then also a defrosted cube of one other fruit puree (blueberry, pear, peach, etc.) and finally a pinch or two of ground flaxseed for the DHA.
depending on your caution w/ allergies - we started also doing scrambled egg yolks before 1 yr, then i'd slowly get less and less careful about separating out the whites, lol, until we did full-on scrambled eggs. many folks recommend avoiding the whites until 1 yr, though.