Single Serve Chocolate Chip Cookie

1. Melt the butter in a bowl in the microwave. 
2. Add the white and brown sugar, and whisk for 1-2 minutes.
3. Add half of an egg yolk and whisk again for 1 minute until smooth. 
4. Sift in the flour, baking soda and salt. Fold until the flour is almost combined. 
5. Add the chopped chocolate and continue to gently fold only until no more streaks of flour are visible. You should not overmix after adding the dry ingredients and chocolate!
6. The batter will be a bit runny at this point - don’t worry! Place batter in the freezer for 10-15 minutes and pre-heat the oven to 375F and line a small baking sheet with parchment paper. 
7. Once the dough is chilled, gently form it into a ball, and place onto the baking sheet. 
8. Bake for just 10-12 minutes until the cookie is firm around the edges but a bit soft in the middle.
9. Enjoy!!! Optional: sprinkle with flakey salt after baking.