Preheat oven to 350 degrees. Whisk together flour, salt, and baking soda. Beat butter and sugars with a mixer on medium-high speed until pale and fluffy, 3 to 5 minutes. Beat in egg and vanilla. Reduce speed to low. Add flour mixture in 2 batches, alternating with sour cream, and beat until just combined. Stir in chocolate chips by hand. Cover, and freeze for 10 minutes.
Using a 1 1/2-inch ice cream scoop or a tablespoon, drop dough onto baking sheets lined with parchment, spacing about 2 inches apart. Flatten slightly. Bake until centers are set and cookies are pale golden brown, 12 to 14 minutes.