In a mixer, beat the butter and sugars. Add vanilla, egg, and salt, and baking soda and mix well. Mix in flour just until combined. Stir in chips. Cover and chill at least 30 minutes. Drop by 2 TBS scoops onto an ungreased baking sheet. Bake at 350 for 7-9 minutes or until golden around the edges. Immediately sprinkle with sea salt. Let cool on the sheet before transferring onto a wire rack to cool completely. Store in an airtight container.