Servings: to 4 dozen depending on the size of your cookie cutters
Cookie Dough: In large bowl or stand mixer, cream together the sugar and butter. Add the eggs, vanilla and sour cream, beat until well combined. In a separate bowl, combine the flour, baking soda, baking powder and salt. Slowly add the flour mixture to the cream mixture, beat until well combined. Divide dough in half, shape into discs. Cover with plastic wrap and chill for at least 4 hours for best results.
Once the dough has chilled, cut each disc in half, keep the other half refrigerated until ready to use. On a well floured surface, roll out dough to 1/4-inch thick. Using a star shaped cookie cutter, cut into shapes. Place cookies onto a parchment lined baking sheet.
Bake at 350 degrees for 6-8 minutes. Remove from the oven and let cool for 5 minutes before removing from baking sheet. Spread with vanilla frosting and sprinkle with red, white and blue sprinkles and Pop Rocks Candy.
Cook's Note: The longer the cookies sit, the less popping action you get, so eat them up right away or sprinkle the Pop Rocks on just before serving! To make this recipe even easier, you could use store bought refrigerated sugar cookie dough!