Usually when Wendy’s schemes a new sandwich, there’s a burger version and a chicken version. This one comes only in chicken. That’s because wholesale cattle prices are sky-high, and burger joints are feeling the beef pinch.

Here’s the Mozzarella Chicken Supreme blueprint: a deep-fried Homestyle chicken fillet of 100 percent premium white meat, two slices of natural mozzarella cheese, lettuce, tomatoes and a creamy sauce made with buttermilk, sour cream and Parmesan cheese on a buttered, toasted bun.

Total calories: 650. Fat grams: 29. Sodium: 1,630 mg. Carbs: 60 g. Dietary fiber: 4 g. Protein: 38 g. Manufacturer’s suggested retail price: $4.69.

Wendy’s is very specific about this sandwich. It comes with a plain, deep-fried Homestyle chicken fillet — not Wendy’s more famous Spicy Chicken fillet or a grilled, unbreaded chicken fillet.

But you know something? I’m guessing you’ve got the kavorka, and if you ask “Pretty please?” Wendy’s will make you a Mozzarella Chicken Supreme with any chicken fillet you wish. Just keep it between you and the friendly person in a hat behind the counter.

Besides, the real star of this sandwich — with top billing — is the mozzarella cheese. You get two nice-size slices of everybody’s favorite pizza cheese. Mozz is a terrific sandwich cheese, too. It lends a soft texture and smoky flavor without overpowering the meat of the matter.

The creamy Parmesan sauce was an interesting choice. My first thought was: “Let’s go all the way Italian. Ladle on the marinara.” When I think chicken parm sandwiches, or mozzarella chicken sandwiches (whatever), I’m thinking red-sauce stains on my pants.

Creamy Parmesan sauce was different — a pretty satisfying companion to the melting mozzarella. Just different.

Wendy’s toasts its buns, and that’s always a nice touch. I wonder why all drive-thrus don’t do it. It’s a competitive world — every little thing counts. Except lettuce. Lettuce is completely unnecessary. Lettuce is the third-string punter of the vegetable world.

I liked the sliced tomato, though. All in all, Wendy’s has a winner here, for the time being. Come on, get this on the permanent menu.

I tried two of these sandwiches (on different days, give me a break), and I started seeing Wendy’s blueprint logic. Only the plain Homestyle fillet would work here. Spicy would be too busy and might cause chicken remorse. Plus, lunch is no time to experiment with mixing and matching new flavors.

Do that at dinner … so I don’t have to hear about your mistakes at the 4 p.m. meeting.