01 -
Whisk together all-purpose flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
02 -
Using a hand or stand mixer, cream the softened butter and granulated sugar together until light and fluffy, about 2 minutes.
03 -
Beat in the egg, sour cream, and vanilla extract until the mixture is smooth and thoroughly combined.
04 -
Gradually add the dry ingredients to the wet mixture, stirring just until combined. Avoid overmixing to maintain tenderness.
05 -
Divide dough into two equal portions, shape each into a disc, wrap in plastic wrap, and refrigerate for at least one hour or overnight for best results.
06 -
Preheat the oven to 350°F. Line baking sheets with parchment paper.
07 -
On a lightly floured surface, roll chilled dough to approximately ¼-inch thickness. Use cookie cutters to cut desired shapes and place them on prepared baking sheets.
08 -
Bake the cookies for 8 to 10 minutes, until edges are just lightly golden. Let cool on the baking sheets for 2 minutes before transferring to a wire rack to cool completely.
09 -
Beat softened butter until creamy. Gradually incorporate powdered sugar, 1 cup at a time, until smooth. Stir in vanilla extract and 1 to 2 tablespoons milk, adjusting to achieve a spreadable consistency.
10 -
Divide frosting and add food coloring as desired for decoration.
11 -
Spread or pipe frosting onto cooled cookies. Add sprinkles or desired decorations. Allow frosting to set prior to storing.