Preheat the Oven: Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper or silicone baking mats.

Cream the Butter and Sugar: In a large mixing bowl, cream the softened butter and granulated sugar together until light and fluffy, about 2-3 minutes.

Add Wet Ingredients: Beat in the egg and vanilla extract until well combined.

Mix Dry Ingredients: In a separate bowl, whisk together the all-purpose flour and kosher salt.

Combine Wet and Dry Mixtures: Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix.

Roll in Sprinkles: Scoop out 1½ tablespoon-sized portions of dough and roll them into balls. Roll each ball in the Christmas-colored sprinkles until fully coated.

Bake the Cookies: Place the sprinkle-coated cookie dough balls onto the prepared baking sheets, spacing them about 2 inches apart. Gently flatten each ball slightly with your fingers or the back of a spoon. Bake for 10-12 minutes, or until the edges are just set and lightly golden. The centers will appear soft but will firm up as they cool.

Cool and Serve: Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Serve and enjoy!