The phrase "addition of pumpkin" refers to adding or including pumpkin to something, like a recipe or dish. It means that pumpkin is being added as an ingredient to enhance flavor, texture, or overall taste. Full definition
That being said, because it is fall after all, you can most definitely make them into pumpkin spice chocolate chip pancakes with the simple addition of some pumpkin pie spice! (beamingbanana.com)
A seasonal dairy free treat, featuring the festive Fall addition of pumpkin. (lillyshummus.com)
This is going to be a really filling breakfast thanks to the wonderful addition of pumpkin. (eluxemagazine.com)