Little Decorated Christmas Cookies

Preheat the oven to 350°F (180°C).

Cream the butter and confectioners' sugar together in a bowl until light and fluffy.

Add the egg yolk, water, all-purpose flour, salt, and vanilla extract to the bowl and mix until a uniform dough forms.

Place the dough into a piping bag and pipe out the cookies into shapes.

Bake the cookies in the preheated oven for 15-20 minutes, or until lightly golden brown.

Melt the white chocolate and add green food coloring to achieve the desired color.

Decorate the cookies with the melted chocolate and sprinkles.