Flashback to that time you somehow convinced your parents to buy Lucky Charms for breakfast. Never happened? Then you fall into that other category: those with cereal envy. Both groups longed for Lucky Charms marshmallows.

Now, you can have a box of ONLY marshmallows. But you have to win it.

In 2015, Lucky Charms gave away ten boxes of the only-marshmallow mix. Fans have been clamoring for a bigger give-away ever since. General Mills' U.S. cereal sales were down 1 percent for the quarter ending February 26, so that time is now.

“Fans of Lucky Charms are obsessed with our marshmallows,” says Priscilla Zee, senior marketing manager in the company blog. “We were overwhelmed with calls, e-mails, and tweets last year, asking for a box of our Lucky Charms marshmallows. So this year we wanted to give them even more opportunities to win.”

First, you'll have to buy a specialty-marked box of Lucky Charms. You'll get a 14-digit code to enter online. If you won, they'll send you one of 10,000 boxes. The promotion runs through the end of the year.