Pre-heat oven to 375 degrees.
In a medium-sized bowl, cream the butter and sugar. Add the egg and egg yolks one at a time and mix well. Mix in the vanilla extract, coconut extract, sour cream, and cocoa powder.
In a small bowl, whisk the flour, salt, and baking soda together. Add the flour mixture to the chocolate mixture and mix just until the flour is incorporated. Fold the chocolate chips and coconut flakes into the cookies dough until well combined.
Form the cookie dough into 2 inch balls and place them on an ungreased cookie sheet. Flatten the cookie balls slightly with your hand.
Place the cookie sheet in the oven and bake for 10 minutes.