Step 1

Preheat oven to 350° F and line a baking sheet with parchment paper.

Step 2

In a large bowl, add the butter and sugar and beat with an electric mixer until light and fluffy.

Step 3

Add the egg and vanilla extract and beat until blended in.

Step 4

Gradually add the flour, baking soda, and salt to the batter and blend just until there are no lumps of flour.

Step 5

Then pour in the 2 tablespoons of milk and mix it in.

Step 6

Add the red and green sugar crystals and gently stir them into the dough.

Step 7

Cover the bowl with plastic wrap and chill in the refrigerator for 30 minutes.

Step 8

Using a cookie scoop, scoop about 1 1/2 tablespoons of dough and roll it into a smooth ball and place them on the lined baking sheet at least 2 inches apart.

Step 9

Bake the cookies 12-14 minutes, until the edges begin to turn light brown.

Step 10

Remove from the oven and gently press a Hershey's Kiss into the top of each cookie immediately.

Step 11

Allow the cookies to cool on the baking sheet for 3-5 minutes and then transfer to a wire cooling rack to cool completely.