Prep Time 25 minutes mins
Cook Time 14 minutes mins
Resting Time 1 hour hr 30 minutes mins
Total Time 2 hours hrs 9 minutes mins
Use room-temperature butter and cream cheese to avoid a lumpy dough or filling, and avoid overmixing the shortbread to keep it tender and crumbly. If the dough cracks when making wells, smooth edges with slightly damp fingertips. For the neatest look, chill the scooped dough balls 10 minutes before pressing the wells. Pistachio paste varies in sweetness—taste the filling and add 1 to 2 teaspoons extra sugar if your paste is very bitter, or a pinch more salt if it’s sweet. The filling sets best when the cookies are fully cool before piping; if your kitchen is warm, chill the filling 10 minutes to firm. Store tightly covered in the refrigerator up to 4 days or freeze un-drizzled cookies up to 2 months and thaw overnight in the fridge.