Make the frosting. In the bowl of a mixer, beat the butter on medium speed until pale and fluffy, about 90 seconds. Add the confectioner's sugar and mapleline, slowly increasing the speed to medium and beating until incorporated. For a fluffier frosting, add heavy cream and mix on medium speed until incorporated.
Frost the crackers. Spread about 1 to 1 ½ teaspoons of maple frosting on the backside of each crackers.
Add the walnuts. Either dip the frosted side of the cracker or sprinkle the chopped walnuts over the frosting. Enjoy!
