For the dictated recipes, I told him to dictate just "flat" the words and numbers. So that I had paragraphs of recipes.
For the scanned recipes, I used Google OCR (I found out it was the best one quality wise).
For both sets of recipes, I then used GPT4 to "format" the unformatted recipes into well formatted Markdown. It successfully fixed typos and bad OCR from Google.
We then pasted all that well formatted text into a big Google Docs, and added images. Using OpenAI image generation I generated images for each of the 250+ recipes. For some of them I had to manually curate it, given that some of the recipes are for typical Mexican food: For example there's a (delicious) recipe called "PibiPollo" that for the unitiated it may look like a stew, so I had to tell something like "large corn tamale with thick hard crust".
In the end, the book was pretty nice! We distributed digital copies within the family and everybody was amazed :) . I loved spending time doing that.