I was searching for something similar recently, as I usually plan my meals around what ingredients I already have in, rather than planning first then shopping. A long time ago I used Allrecipes dinner spinner, where you could enter your ingredients and it would return a list of recipes you could make (sorted by how good a match it is, ie a recipe using all your ingredients will appear at the top). However it used its own recipe database, which I didn't find that appealing.
It would be cool if EYB could implement this feature of searching by a list of ingredients and returning your bookshelf recipes that contain at least one of those ingredients, sorted by most to least. I know we could search using the OR boolean function but I don't think it's possible to sort the results this way, and a dedicated feature would make it more intuitive.