Microwave the butter for about 40 seconds. Butter should be completely melted but shouldn't be hot.
In a large bowl, mix butter with the sugars until well-combined.
½ cup butter, ½ cup granulated sugar, ¼ cup brown sugar
Stir in vanilla and egg until incorporated.
2 teaspoons vanilla extract, 1 large egg
Add the flour, baking soda, and salt. Please read the recipe note about properly measuring flour.
1 ¾ cups all-purpose flour, ½ teaspoon baking soda, ½ teaspoon kosher salt
Mix dough until just combined. Dough should be soft and a little sticky but not overly sticky.
Stir in chocolate chips.
1 cup semisweet chocolate chips
Scoop out 1.5 tablespoons of dough (medium cookie scoop) and place 2 inches apart on baking sheet.
Bake for 7-10 minutes, or until cookies are set. They will be puffy and still look a little underbaked in the middle.3
Video
Notes
Flour: Be sure to fluff and then scoop and sweep to measure the flour. Too much flour will result in a dry or crumbly cookie. For the ingredient measurements by weight, please click "metric" directly underneath the ingredients.
Salt: Or 1/4 teaspoon table salt.
Baking: Don't over-bake the cookies, or you won't end up with soft cookies. Several people have said that they've needed to bake the cookies for longer. Since oven temps can vary, I suggest starting with the listed baking time and increasing the time as needed.
If you're interested in the chocolate version of these cookies, you can find that recipe here.