Ingredients:

• Nonstick cooking spray, for greasing the pan
• 1 1/3 cups (180g) all-purpose flour
• 1 teaspoon kosher salt
• 1/2 teaspoon baking soda
• 1/4 teaspoon baking powder
• 2/3 cup (180g) creamy peanut butter, such as Skippy or Jif
• 6 tablespoons (84g) unsalted butter, room temperature
• 2/3 cup (150g) packed light brown sugar
• 1/3 cup (70g) granulated sugar
• 1 large egg, at room temperature
• 1 teaspoon vanilla extract
• 24 to 30 mini peanut butter cups, unwrapped