>>56497808You can't check this multiplier in-game, you have to use external references.
That said, sorting your recipes by strength level is generally the way to go. It can become immediately obvious which dishes are better when you've got a much lower level dish that happens to be as strong as, if not stronger than one of your high level dishes.
There's two desserts dishes stronger than Jigglypuff's Fruity Flan. They're "Teatime" Corn Scones, and "Flower Gift" Macarons, which have a base 48% bonus.
Currently there are 7 kinds of dishes with this bonus level, and 4 of them use corn.
There's also 11 kinds of dishes with a 35% bonus, and 5 of these also use corn.
Simply put, corn is really important, you use across the best dishes of all types of meals.
This is why Bewear and Dratini are so sought after, they're the best corn gathers. Comfey is good too, but at a distant third.