This week I reached out for a new Signature Sriracha 1/4 lb. Burger, the latest addition to the haute cuisine “Signature Crafted Line” at America’s No. 1 burger slinger, McDonald’s, with 15,000 restaurants blurring the red, white and blue.

McDonald’s … Sriracha … what took you so long? This just in: Even the drive-thru set likes spicy food. The other burger barns have been turning up the heat with Sriracha for a few years. Did you think they were just blowing smoke?

Here’s the Signature Sriracha 1/4-Pound Burger breakdown: a 1/4-pound beef patty, spicy chili-infused Sriracha Mac Sauce, tender baby spinach and kale, smooth white cheddar cheese, crispy onions and tomato on either an artisan roll or a sesame-seed bun. The smart play would be a toasted potato bun.

Whoa, spinach and kale on a McDonald’s burger? This must be Ronald’s attempt at health food. Until we get a load of …

Total calories: 670. Fat grams: 35. Sodium: 1,010 mg. Carbs: 56 g. Dietary fiber: 4 g. Protein: 32 g. Manufacturer’s suggested retail price: $4.99.

Still, baby spinach and kale are baby steps in the right direction, if only for eye candy, so good on McDonald’s. Other sandwiches in the Signature Crafted Series are: Maple Bacon Dijon, Pico Guacamole and Sweet BBQ Bacon. The burger patty can be switched out for a deep-fried buttermilk crispy chicken or an artisan grilled chicken breast.

Obviously, the star attraction and big difference now is the Sriracha Mac Sauce. Unlike some hair-raisers that deliver a slow burn, the Sriracha Mac Sauce delivers a lightning jolt of heat that fades fast. Still, it’s the hottest condiment in McDonald’s array of shmears and dipping sauces. The Sriracha Mac Sauce is available for Chicken McNugget plunking, too.

For everything else, this is a regular old Quarter-Pounder all gussied up. That’s not a knock, since McDonald’s knows its way around ground beef and a hundred billion trillion people seem to enjoy its burgers. And credit where it’s due: The beef has no fillers, no additives and no preservatives. So, fans of pink slime and artificial flavors and colors, sorry.

The Signature Sriracha 1/4 lb. Burger is a limited-time special, so get ’em while they’re hot.