Burger King now has a Lucky Charms milkshake — a combo of childhood nostalgia, ice cream and enough sugar to test the luck of any leprechaun.

Mixed together are vanilla soft-serve ice cream, syrup, Lucky Charms cereal and, of course, marshmallows.

The U.S. Food and Drug Administration hasn't established how much sugar is OK to eat in a day, but it's safe to say this concoction's 107 grams of sugar would not be part of a balanced breakfast.

Altogether, it has 740 calories, 17 grams of fat, 580 mg of sodium and 129 grams of carbohydrates. The cost: $2.99. It's available for a limited time at participating Burger King restaurants across the nation.

The Lucky Charms shake is latest in a trend of taking sugary cereals, once served as a nutritious breakfast by parents across America, and injecting them into ice cream and other treats.

Burger King has served a Froot Loops shake, which combined vanilla soft-serve, Froot Loops cereal and "sweet sauce." Ben & Jerry's introduced new flavors earlier this year to taste like the milk leftover after three childhood staples: Frosted Flakes, Cocoa Pebbles and Froot Loops.

The company is excited about the partnership.

"The mashup of our velvety vanilla-flavored soft serve and one of America's classic breakfast cereals is something we think our guests are going to love," said Alex Macedo, Burger King's president of North America.