These S'mores Sandwich Cookies are a super simple treat with a gooey marshmallow filling and a rich chocolate coating. They're easy to make and perfect for satisfying your sweet tooth!
Line a large sheet pan with parchment paper and set aside.
Gently break full sheets of graham crackers in half to get 24 squares.
Generously spread vanilla marshmallow frosting on one-half (12) graham crackers (I use the whole container in this recipe, but scale down if you like less frosting). Gently press the remaining graham crackers on top to make sandwiches, smoothing the edges with a knife.
In a large microwave-safe bowl, add chocolate chips and shortening, and microwave in 10 to 15-second intervals, stirring between bursts until smoothly melted.
Use a large fork to hold each sandwich, spoon melted chocolate over it, and tap the fork on the bowl’s edge to remove excess chocolate. Reheat chocolate as needed for easier dipping.
Place sandwich cookies on the sheet pan and leave at room temperature until chocolate hardens. (Place in the fridge for quicker hardening!)