In a bowl, mix together all of the dry ingredients.
In a stand mixer bowl, beat the butter until it’s smooth. Add the sugar and continue beating for 3 minutes, then add the eggs one at a time, beating in between eggs, then add the vanilla.
Add the dry ingredients slowly and in batches, mixing in between.
Remove the dough from the bowl, and separate into three equal parts. Take one part out and flatten it into a ¾ inch slab, wrapping that part in saran wrap, and keeping that part in the fridge.
Add one part back to the mixer bowl, and beat in the red food coloring until you get your desired color.
Take this part out of the mixer, roll the dough into a ball, then squeeze the dough into a ¾ inch-thick disk.
Wrap the disk in saran wrap, and place it into the fridge for 1 hour.
Repeat the last two steps for the blue food coloring.
Take each part out of the fridge, letting them sit outside for 15 minutes.
On a lightly floured surface, roll out each piece of dough ¼ inches thick.
Place each piece of dough on top of each other, and lightly roll the pieces together.
Cut the excess dough off of the edges into a rectangular shape.
Tightly roll the pieces together, ensuring that there’s no space between each slab of dough, into a cylinder shape.
Wrap the cylinder in saran wrap, and tightly wrap the ends off so the roll doesn't unravel.
Refrigerate the roll for 1 hour, occasionally taking them out and rolling them on a flat surface, to ensure that the roll doesn't become flat.
Preheat the oven to 350°F, and line a baking sheet with parchment paper or a silicone mat.
Take the roll out of the fridge and the saran wrap, and cut the roll vertically into ¼ inch slices.
Roll the edges of the cookie in small or medium sized sprinkles.
Place the cookies onto the baking sheet, and cook for 8-10 minutes.
Notes
It can be beneficial to make the dough the night before you are planning to make cookies.
You may freeze the roll of dough, which will stay good for 3 months, only defrosting the dough in the fridge before baking. Likewise, you can freeze the already baked cookies.
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