For the cookies:
1 cup shortening
1/3 cup granulated sugar
1/2 cup light-brown sugar
1 large egg yolk
2 teaspoons vanilla extract
2 cups all-purpose flour, sifted
1/2 teaspoon salt
1 cup mini chocolate chips
Preheat oven to 350°F. Grease the molds of a popover pan.
In a large bowl, cream together the shortening and brown and granulated sugars. Add the egg yolk and vanilla extract, and mix until completely incorporated. Gradually add the flour and salt, and mix until completely incorporated. Add the mini chocolate chips, and mix together until evenly distributed. The dough should be a little crumbly at this point.
Form the cookie shots inside the molds, making the walls of the cookie shot about 1/4 inch thick. Chill for 20 to 30 minutes before baking.
Bake for about 20 minutes or until the cookies just start to brown. Remove from the oven, and let cool completely.
Melt chocolate candy melts, and then pour the melted chocolate into the well of each cookie. Let it sit for a minute, and then pour the excess chocolate back into the pan. Chill cookie shots until the chocolate has set.
Mix together milk and vanilla extract, and serve inside each cookie shot.