Step 1

Heat the butter in a saucepan until it is all melted, darker in color, and the milk solids are caramelized. The butter should smell nice and nutty.

Step 2

Chill the butter in the freezer for 10 minutes.

Step 3

Mix together the flour, cornstarch, baking soda, and salt together in a small bowl and set aside.

Step 4

Beat the butter and both sugars until light and fluffy.

Step 5

Add in the egg, yolk, cream, and vanilla. Beat well.

Step 6

Stir in the flour mixture and mix until just combined,

Step 7

Fold in the chopped chocolate.

Step 8

Portion the cookie dough into balls and set aside to rest while the oven preheats, preferably in the refrigerator.

Step 9

Preheat the oven to 350°F. Line two baking sheets with parchment paper.

Step 10

Place the cookie dough 2-inches apart on your baking sheets and bake for 8 - 10 minutes, or until golden brown.

Step 11

Allow the cookies to rest on the baking sheet for one minute before transferring to a wire rack to cool completely. Top with flaky sea salt while still warm