Brown the butter in a saucepan over medium heat until it smells nutty, then cool 10 minutes.
Beat the brown butter with both sugars. Beat in the eggs and vanilla.
Stir in the flour, baking soda, and salt, then the chocolate chips. Chill 30 minutes.
Heat the oven to 350°F. Scoop 2-tablespoon balls onto a lined sheet and bake 11 to 13 minutes, until the edges are set.
Pull them when the centers still look a little underbaked.