Step 1

Brown butter in a skillet over medium heat until a nutty brown color. It will most likely foam up and have a few brown specks in it. This is to be expected. It should smell toasted and be a light golden brown, be careful not to let it burn. Let cool slightly while you gather the remaining ingredients.

Step 2

Beat together brown butter, brown sugar and white sugar in your mixing bowl. Set aside to cool slightly.

Step 3

In another bowl, combine the flour, cornstarch, baking soda, baking powder and salt. Stir with a whisk.

Step 4

Add the eggs to the butter mixture, one at a time, mixing after each until incorporated. Stir in the vanilla.

Step 5

Add the flour mixture to the wet ingredients a little at a time and beat until combined.

Step 6

Stir in the oats, walnuts or pecans and chocolate chips.

Step 7

Refrigerate the dough for at least one hour.

Step 8

Preheat oven to 350°F. Use a medium cookie scoop (or a about 1½ Tablespoons) of dough per cookie onto a cookie sheet and bake for 8 to 10 minutes.

Step 9

When you remove it from the oven, sprinkle each cookie with a pinch of sea salt if desired.

Step 10

Cool on baking sheet for 5 minutes, then remove onto a cooling rack.  Once completely cooled, store in an airtight container at room temperature or freeze until ready to eat.