Step 1

Preheat an oven to 350°F (180°C). Line 2 baking sheets with parchment paper.

Step 2

In a large bowl, using an electric mixer on medium speed, beat the butter, both sugars and peanut butter until blended. Add the egg and vanilla and beat until blended. Add the flour, peanuts, baking soda and salt and beat on low speed until blended.

Step 3

Shape the dough into 1 1/2-inch (4-cm) balls, placing 12 balls at least 2 inches (5 cm) apart on each baking sheet. Dip a fork in flour, then press twice into each cookie to make a crisscross pattern, then sprinkle with flaky sea salt. Bake the cookies until golden, 8 to 10 minutes. Let the cookies cool on the pans for 5 minutes, then transfer to wire racks and let cool completely. Makes about 2 dozen cookies.

Step 4

Adapted from Williams-Sonoma Newlywed Cookbook (Weldon Owen, 2016)