Cream Butter and Sugar: Beat one stick of room temperature unsalted butter, one cup of granulated sugar, and fresh lemon zest together in a stand mixer fitted with a paddle attachment until light and fluffy.
1 stick unsalted butter, 1 cup granulated sugar, 1 lemon for zest
Add Eggs and Salt: Mix in two large eggs one at a time, allowing each to fully blend before adding the next, followed by a pinch of salt to balance the sweetness.
2 large eggs, Pinch of salt
Incorporate Dry Ingredients: Sift or whisk together two cups of all-purpose flour and one and a half teaspoons of baking powder, then gradually add them to the butter mixture on low speed until just combined into a smooth dough.
2 cups all-purpose flour, 1 ½ teaspoons baking powder
Fold in Fruits and Nuts: Gently fold in one cup of dried cranberries and one cup of chopped pistachios using a rubber spatula so they retain their natural shape throughout the dough.
1 cup dried cranberries, 1 cup pistachios
Shape and Bake Log: Form the dough into a long log shape on a baking sheet lined with a silicone baking mat or parchment paper and bake at 350 degrees Fahrenheit for 40 minutes.
Slice and Second Bake: Remove the baked log from the oven, let it cool slightly, and slice it diagonally into half-inch to three-quarter-inch thick pieces, then return them to the oven to bake for another 15 minutes until crisp.
Dip and Decorate: Dip one half of each cooled biscotti into melted white chocolate, place them on a wire rack, and immediately sprinkle them with red and green sanding sugar for a festive holiday sparkle.
12 ounces white chocolate, Red sanding sugar, Green sanding sugar