"Sandwich cookies" refers to a type of cookie that is made up of two layers with a creamy filling in the middle, resembling a mini sandwich. Full definition
It's been formally decided that all sandwiches I consume from here on out must be chocolate sandwich cookies with the most gorgeous pink filling ever. (wholeandheavenlyoven.com)
A simple mixture of natural peanut butter, pure maple syrup, and unsweetened vanilla almond milk makes an ultra creamy and rich center for our peanut butter sandwich cookie perfection. (fooduzzi.com)
When making sandwich cookies try to make the cookies all the same size because if the cookies are different sizes they don't fit together perfectly and the filling may leak out. (joyofbaking.com)