I'd probably find myself less motivated to simply type something out to recipe.txt vs. manage all this but CookCLI does open up some interesting possibilities.
The first thing that came to mind would be that it'd be cool if CookCLI could "halve" recipes automatically. Say you had a recipe for 12 muffins but you only wanted to make 6 or 4, it could automatically divide those quantities and spit out a new recipe or shopping list.
Another cool CLI feature would be unit conversion; converting things like fluid ounces, or cups into ml.
My other piece of feedback is the overloading of {} for ending multi-word ingredient seems a bit off. It's more syntax but I'd still rather have something dedicated for that purpose eg. @(ground black pepper)