A Costco shopper put the big box retailer on blast on Reddit this week after noticing that the $9.99 six-packs of 'mix and match' muffins were being replaced.

The double chocolate muffins are another Costco bakery item that have received a recent reformulation. Until recently, the oversized muffins used to be sold in a six-pack.

While the jumbo 12-count mix-and-match muffin packs -- blueberry, poppyseed, and chocolate chunk, to name a few -- may be a thing of the past, Costco hasn't abandoned its muffin fans entirely.

Costco's bakery is switching to smaller muffins and will no longer offer mix-and-match muffins. Instead of mixing and matching two 35-ounce six-packs of the larger muffins for $9.99, warehouses ...

Costco members complain about declining quality in popular bakery items like muffins, bagels, and cookies, sharing their ...

Yep, there's a trick to getting your chocolate chip cookies to turn out like this—and we have all the delicious details.

Turns out, what Costco does with leftover muffins and other bakery items is even sweeter than the pastries themselves. Read on to find out how the muffins get a second life.

Related: The First-Ever Costco with Apartments Is Coming Soon The Best Way to Thaw and Reheat Costco Muffins. You have some options here, depending on what kind of kitchen equipment you have and ...