This is my desert island chocolate chip cookie — chewy middles, crispy edges, and two small tweaks on the Toll House classic that make it the one I always come back to.
Whisk the flour, baking powder, baking soda and salt in a medium bowl.
Mix 8 ounces room temperature unsalted butter, ⅓ cup granulated sugar, and 1 cup packed light brown sugar in the bowl of a stand mixer on medium-low speed (or use a hand mixer) using the paddle attachment until light and fluffy, 3 or 4 minutes. Add 2 large eggs one at time, mixing until each one is incorporated. Add 2 teaspoons vanilla extract and mix it in.
Add the flour mixture to the butter mixture in 2 additions, beating on low speed just until the flour is incorporated. Stir in 8 ounces semisweet or bittersweet chocolate bars. Put the bowl in the refrigerator while the oven heats, about 20 minutes.
Heat the oven to 350 (175C) degrees with the rack in the center of the oven. Line 2 baking sheets with parchment paper.
Scoop 2 tablespoon-sized balls of dough onto the sheets, spacing 1 1/2 inches apart. Bake the cookies one sheet at a time for 13-15 minutes, until the edges turn lightly golden. Cool on the pan for 3 minutes. Transfer to a rack to cool completely,
Notes
This cookie scoop makes perfectly sized blobs of dough and uniformly-shaped cookies.
Storage and make ahead: The best way to keep these chocolate chip cookies is to store them in a zippered plastic bag.
Make the dough through Step 3 and refrigerate up to one day ahead.