Set your oven rack to the middle position and heat the oven to 375 degrees. Line a rimmed baking sheet with parchment paper or a silicone baking mat.
1 ¼ cups all-purpose flour, ½ teaspoon table salt, ½ teaspoon baking soda, ¼ teaspoon baking powder
In a medium bowl, whisk together the flour, salt, baking soda, and baking powder.
8 tablespoons salted butter, cut into 8 pieces and well softened, ½ cup packed brown sugar, ¼ cup granulated sugar, 1 large egg, ½ teaspoon vanilla extract
In a large bowl, combine the softened butter, brown sugar, and granulated sugar. Use a rubber spatula to vigorously stir and mash until well combined and the mixture is creamy. Add the egg and vanilla and whisk until combined and smooth.
1 cup semisweet chocolate chips
Add the flour mixture to the bowl with the butter mixture and stir with the rubber spatula until no dry flour remains and a soft dough forms (make sure to scrape along the bottom and sides of the bowl to get all of the dry flour). Stir in the chocolate chips until evenly distributed.
Use a #20 (3 tablespoon) size portion scoop or a 1-tablespoon measuring spoon to divide the cookie dough into twelve 3-tablespoon portions and place them on the parchment-lined baking sheet, evenly spaced.
Place the baking sheet in the preheated oven. Bake until the edges of cookies are browned and the centers are puffy, 10 to 14 minutes.
Use oven mitts to remove the baking sheet from the oven and place it on the stovetop or a cooling rack. Let the cookies cool on the baking sheet for at least 15 minutes. Serve warm or at room temperature. (Leftover cookies–if there are any!–can be kept in an airtight container for up to 3 days.)