Whisk the flour, baking soda, and salt in a medium bowl.
Beat the butter and sugar in a large bowl with an electric mixer (a hand mixer or stand mixer with a paddle attachment) until smooth and creamy. Beat in the egg and vanilla.
Add the flour mixture to the butter mixture and mix at low speed to combine. Stir in the white chocolate chips.
Use a medium-sized cookie scoop to form the dough into balls. Place the cookie dough balls on baking sheets lined with parchment paper.
Place the sheets in the oven and bake the cookies for 8 to 10 minutes at 350°F.