No butter, no flour, no white sugar - and yet, they are delicious!
1 cup creamy peanut butter (I prefer creamy honey roasted; plain or crunchy may be used; do not use natural or homemade peanut butter - see below)
1 cup light brown sugar, packed
1 large egg
1 tablespoon vanilla extract
1 teaspoon baking soda
6 ounces semi-sweet, dark, or bittersweet chocolate, chopped (1 cup semi-sweet chocolate chips may be substituted)
To the mixing bowl of a stand mixer fitted with the paddle attachment, combine peanut butter, brown sugar, egg, vanilla, and beat on medium-high speed until well-combined and the sugar is fully incorporated and is mixture is no longer gritty or granular, about 3 minutes. Stop to scrape down the bowl as necessary. (Note regarding peanut butter - although natural peanut butter or homemade peanut butter may work, I recommend using storebought peanut butter like Jif, Skippy, Peter Pan or similar so that cookies bake up thicker and spread less. Using natural or homemade peanut butter tends to result in thinner and flatter cookies that are prone to spreading while baking)
Add the baking soda and beat to incorporate. Add the chocolate and beat to just incorporate; don't overmix or the nice chocolate chunks will break down. Transfer dough to airtight container and refrigerate for at least 2 hours, and up to 5 days, before baking.
Preheat oven to 350F, line 2 baking sheets with Silpat Non-Stick Baking Mats, parchment, or spray with cooking spray; set aside. Using a 2-inch cookie scoop (about 2 tablespoons of dough or about 1.60 to 1.75 ounces by weight), form dough mounds and place on prepared baking sheet, spaced 2 inches apart (8 to 10 per tray). If chocolate is falling out of dough since there is an abundance, roll ball between palms to encourage it to stay in the dough. Slightly flatten the mounds before baking so they don't stay too domed and puffed while baking, just don't over-flatten.
Bake for 8 to10 minutes, until edges are set and tops are barely set, even if slightly underbaked in the center. Watch them very closely after 7 minutes and I recommend not baking longer than ten minutes.