In the bowl of a stand mixer, combine the peanut butter, softened butter, brown sugar, and granulated sugar. Beat on medium-high speed for approximately one minute, until creamed together.
Mix in the eggs and vanilla extract.
Add the baking soda, baking powder, salt, and flour in the order listed. Mix until fully incorporated.
Melt ½ cup of the chocolate chips in a microwave-safe bowl, heating in 15- to 20-second intervals.
Drizzle the melted chocolate over the dough. Slide a knife through the dough to create a marble effect without mixing the chocolate completely into the peanut butter dough.
Using a ¼-cup cookie scoop, portion the dough onto a parchment-lined baking sheet.
Freeze the scooped dough for at least one hour.
Preheat the oven to 350 °F.
Arrange the chilled dough portions on a parchment-lined baking sheet, leaving room between the cookies. Approximately six cookies will fit on each sheet.
Bake for 13 to 15 minutes, or until set and lightly browned.
If desired, gently press a fork into the tops of the warm cookies to create a crisscross pattern.
Let the cookies cool on the baking sheet for approximately eight minutes before transferring them to a cooling rack.
Melt the remaining 1 cup chocolate chips.
On a parchment-lined baking sheet, drop approximately one teaspoon of melted chocolate for each cookie. Place a cooled cookie on top, pressing and gently moving it to coat the bottom with chocolate.
Allow the chocolate to set until dry to the touch. For faster setting, place the cookies in the freezer for a few minutes.
Notes
Cookie size: The ¼-cup scoop makes approximately 3½-inch cookies. A 3-tablespoon scoop can also be used; reduce the baking time and check for doneness earlier.
Marbling: Avoid stirring the melted chocolate into the dough. Use a knife to create distinct chocolate swirls.
Crisscross pattern: Optional. The cookies bake evenly without it.
Round cookies: Use a glass slightly larger than the cookies to gently shape them while they're still warm.
Storage: Keep in an airtight container at room temperature. Best within one to two days, but still delicious for up to five days.
Freezing: Freeze in an airtight container for up to three months.
This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.