Line baking sheet with parchment paper. Set aside.
In mixing bowl, combine corn starch, brown sugar, salt, granulated sugar, baking soda, baking powder, & walnuts. Mix together with your hands to combine.
Add eggs, vanilla, & butter to the mixture. Knead with your hands to incorporate.
Add flour & chocolate chips to the mixture. Continuing mixing together with your hands until it forms a thick dough. (tip: it will not easily come together at first--keep working the dough together until it forms a ball)
Separate dough into 6-8 even balls (you can make more or less depending on the size of cookie you desire). Gently press dough into ball shape & flatten the bottom with your hands.
Place cookie balls on baking sheet & place in fridge for 1 hour. (tip: you want to make sure the baking sheet you place in the fridge is the one you'll be using to cook the cookies. also, don't skip this step--it's essential to getting the dough to remain fluffy.)
Preheat oven to 350F. Bake cookies for 10-14 minutes. Let cool on cooling rack, serve, & enjoy!