Chocolate Shortbread Cookies

• 1 balls
• 1/4 thickness with tines of a fork
• 230 gr semisweet chocolate
• 190 gr all purpose flour
• 130 gr chocolate (white)
• 120 ml cream (heavy)
• 100 gr powdered sugar
• 100 gr butter (unsalted)
• 5 gr cocoa powder
• 4 gr vanilla extract