Somehow, Crumbl is nine. The cookie chain that has spent the last few years being the fastest-growing name in a category defined entirely by the speed of its growth is celebrating its ninth birthday this week, and the way it is celebrating, like the chain itself, is by doing a thing with a number in it that is, on the surface, a deal, and underneath the surface, a small monument to how the whole thing is now a thing with a number in it.

Birthday Week runs September 21 through 26, and the menu, per the company’s own release, is six desserts — a new Pink Sugar Cookie Cake, a returning Dubai-Style Chocolate Brownie, and the rest of a lineup that the chain has assembled with the energy of a brand that has been told, repeatedly, by the people who love it, that it should do more. And so it has. Six desserts. That is the number. The number is the point. The number has always been the point.

But here is the number with the number in it, the one the store clerks are already saying out loud, the one the regulars are already doing the arithmetic on: on Thursday, September 24, Crumbl is running a one-day 6-for-4. Six desserts for the price of four. You buy four, you eat six. The two extras are not a discount. The two extras are a gift, and the gift is the fact that you have, in the space of a single transaction, consumed more cookies than a nine-year-old has a right to consume, and you have done it for the price of a nine-year-old’s lunch.

"You get six. You pay for four. You leave with the two. Nobody has ever come back, because there is nowhere to put the two."

I called one, because the deal is the deal and I have learned, over the years, that a deal is not real until you have made a human being say it to you with the exact cadence of a person who has said it six times before and will say it eleven more times before lunch. The woman on the phone told me about the 6-for-4 the way you tell someone about a thing that has already become part of your identity. “Thursday,” she said. “Thursday only. You get six for the price of four.” I asked if I could, say, come in on Thursday and get six for the price of four, and then, on Friday, get six for the price of four, and she laughed in a way that told me the answer was no and also told me the answer was no because Thursday is Thursday and the deal is the deal and the deal is one day and the deal is not, as I had briefly, stupidly, hoped, a lifestyle.

THE MATH OF THE 6-FOR-4, AS TOLD TO ME BY A CLERK ON THURSDAY, TWICE

  • You buy: 4
  • You eat: 6
  • You keep: 2
  • You regret: 0 (for about 40 minutes)
  • The day it happens: September 24, one day only
  • The chain's age, for context: 9, which is also a number

At press time, the countdown to Thursday was on, the birthday week was in full swing, and the store, when I asked what the big plan was for the 6-for-4, told me the same thing every store has told me, which is that the plan is to have enough, and that “enough” is a number they are working on, and that the only number they have ever gotten right is the one on the sign that says six, because that is the number you can hold, and that is the number you can fit in a bag, and that is the number that, when you get home and open the bag and there are six of them, makes you understand, in your body, what a nine-year-old chain is for.