Costco is now offering delivery for its famous sheet cakes and party platters, giving shoppers a major convenience perk when ordering customizable items.

Instacart, Costco’s primary delivery partner, announced Wednesday that shoppers can now order bakery and deli options through its marketplace and SameDay Costco and customize them in advance for delivery.

The newly available items include its beloved custom sheet cakes and 10-inch round cakes. Customers can also order sandwich platters, shrimp trays and fruit platters.

The move marks a significant expansion of Costco’s digital offerings for the fan-favorite products, which were previously unavailable for online ordering until February, when Costco retired a decades-old system that required customers to visit a warehouse and fill out paper order forms.

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Newly available items include custom sheet cakes and 10-inch round cakes, Costco and Instacart said. (Marlene Awaad/Bloomberg via Getty Images / Getty Images)

“For nearly a decade, we’ve worked closely with Costco to expand the ways their members can shop online, and this is another exciting step in that partnership,” Ryan Hamburger, chief commercial officer at Instacart, said in a statement. 

“We’re proud to bring Costco’s beloved made-to-order bakery and deli to sameday.costco.com and the Instacart marketplace, making delivery available for the first time and giving members even more ways to order for life’s biggest celebrations.” 

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Instacart, Costco’s primary delivery partner, announced shoppers can order the bakery and deli options through its marketplace and SameDay Costco. (Instacart)

According to Instacart, shoppers can choose the size, shape and flavor of their cake from a catalog of available options. 

They can also select from a preset list of designs and add a message of up to 30 characters in a color of their choice. 

The move marks a significant expansion of Costco’s digital offerings for fan-favorite products. (Lindsey Nicholson/UCG/Universal Images Group / Getty Images)

Wednesday’s announcement builds on Instacart’s longstanding partnership with Costco, which began in 2017 with the launch of same-day delivery.  

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Since then, the companies have expanded their partnership to include Costco’s same-day e-commerce sites. 

Costco did not immediately respond to FOX Business’ request for comment.