Step 1

Heat oven to 325 degrees F. Line a baking sheet with parchment paper or a silpat baking mat.

Step 2

Melt the butter for about 45 seconds in the microwave, until it's almost completely melted. Remove and stir it, allowing any remaining butter to melt. Allow the butter to cool until it's almost room temperature, but still a liquid.

Step 3

In a medium bowl mix together flour, salt, and baking soda.

Step 4

In a separate large mixing bowl mix the butter and sugars together until well combined. Add the egg, egg yolk, and vanilla and stir until combined.

Step 5

Stir in the dry ingredients and chocolate chips, just until combined. The dough will be soft.

Step 6

Gently scoop dough into balls and place on a cookie sheet. Bake for 10-12 minutes. Store in an airtight container.