Preheat oven to 375°F. Line a baking sheet with parchment paper or a silpat. Set aside. In a medium bowl, whisk together flour, baking powder and salt. Set aside. In a stand mixer, beat butter and sugar until light and fluffy. Add cranberry jelly, egg and vanilla extract, mixing until combined. Add flour mixture 1/2 cup at a time, mixing until completely combined. Drop one tablespoon of rounded dough onto prepared pan and then lightly flatten with the bottom of a buttered and sugared glass. Bake for 10 minutes. The cookies will not look browned or cooked, but they are! Remove from oven and let cookies rest on baking sheet for 5 minutes. Then transfer to a wire rack to cool completely. To Ice: In a small bowl, toss together cranberries and sugar, set aside. In a small bowl, whisk together powdered sugar, milk and vanilla extract - until smooth. Using a spoon, smooth icing onto the top of each cookie. Sprinkle with sugared craisins and let set for 10 minutes, or until hardened. Enjoy!