Cookies:
1 cup (2 sticks) butter, softened
1 cup sugar
¾ cup brown sugar
2 eggs
1 Tbsp vanilla extract
3 ½ cups flour
1 tsp baking soda
1 tsp salt
2 cups milk chocolate chips

Frosting:
1 1/2 sticks salted butter, room temperature
¼ + ⅛ cup packed brown sugar
2 cups powdered sugar
1/2 cup flour
1/2 tsp salt
3-4 Tbsp milk
1 1/4 tsp vanilla