Chocolate, Hazelnut, and Caramel Thumbprint Cookies

1. In a small bowl combine flour and cocoa powder; set aside. In a medium bowl beat butter with an electric mixer on medium to high speed for 30 seconds. Add sugar and salt; beat until combined, scraping side of bowl occasionally. Beat in egg yolk, milk, and vanilla until combined. Beat in as much of the flour mixture as you can with the mixer. Using a wooden spoon, stir in any remaining flour mixture. Cover; chill for 1 hour.

2. Preheat oven to 350 degrees F. Grease two cookie sheets; set aside. Shape dough into 1-inch balls. Place the 1 cup hazelnuts on a sheet of waxed paper. Dip balls in egg white and roll in hazelnuts. Place 1 inch apart on prepared cookie sheets. Using your thumb, make an indentation in the center of each cookie. Bake for 10 to 12 minutes or until edges are firm.

3. Meanwhile, for filling, in a small saucepan cook unwrapped caramels and cream over low heat until caramels are melted and the mixture is smooth, stirring frequently.

4. Immediately after removing cookies from the oven, use the rounded side of a 1-teaspoon measuring spoon to press down the center of each cookie. Transfer to wire racks; cool. Spoon about 1 teaspoon filling into the center of each cookie.

5. In a small microwave-safe bowl combine chocolate pieces and shortening. Microwave on 100 percent power (high) for 30 to 45 seconds or until softened; stir until smooth. Place a small mound of chocolate on top of each cookie. Top with a whole hazelnut. Let stand until chocolate is set.