1/2 cup (1 stick) unsalted butter, room temperature

1/2 cup creamy peanut butter

1/2 cup granulated sugar

1/4 cup plus 2 tablespoon light brown sugar

1 large egg

1/2 teaspoon vanilla extract

1 and 1/2 cups all-purpose flour

1/2 teaspoon baking soda

1/2 teaspoon baking powder

1/2 cup roasted, unsalted peanuts, coarsely chopped

1 cup bittersweet chocolate chips

Fleur de sel, to taste (Sea salt)