Sift together flour and confectioner's sugar. Add almond flour and salt. Using pastry cutter or fingers, mix in butter until incorporated (do not overmix).
Preheat oven to 350F. Using cookie cutters, cut out desired shapes (trees, snowmen, stars, balls etc.) from dough.
Transfer cookies to parchment paper-lined baking sheet; bake on center rack for about 15 minutes or until cookies turn golden brown. Remove from oven; let cool.
Spoon NUTELLA hazelnut spread into small piping bag; decorate cookies with NUTELLA hazelnut spread and sugar pearls.