Preheat oven to 350 degrees.
Line a cookie sheet with parchment paper.
In a mixing bowl, add the flour, baking powder, and salt and whisk. Set aside.
In a large bowl, add the butter and beat until creamy.
Next, add the sugar and mix.
Add the egg and vanilla extract and mix well.
Next, add the flour mixture and mix until combined.
Cut the dough in half. Take half and place it back in the mixer.
Add the red food coloring and mix. Keep adding red until you reach the desired color.
Once combined, press the cookie dough into a square and wrap in plastic wrap. Refrigerate for one hour.
Clean out the bowl and repeat with the green color and the other half of the cookie dough.
Wrap and refrigerate for one hour.
After one hour, roll out each cookie dough separately to about 1/4-inch thick with a rolling pin. Roll it out between two pieces of parchment paper.
Lay the red cookie dough on top of the green and gently roll it into a log.
Pour the sprinkles onto plastic wrap or parchment paper and roll the cookie dough log through the sprinkles until covered.
Wrap the cookie dough in plastic wrap and refrigerate for two hours.
After refrigerating, slice the cookie dough about one inch thick and place it on a cookie sheet covered with parchment paper.
Bake for about 10-12 minutes. Allow the cookies to cool.