Peanut Butter Sandwich Cookies, aka "The Nora Ephron"

INGREDIENTS

• 1 1/2 cups (14 ounces/400 grams) creamy peanut butter, such as Skippy
• 6 tablespoons (3/4 stick/3 ounces/168 grams) unsalted butter, softened
• 1/2 teaspoon baking powder
• 1 teaspoon kosher salt
• 1 1/2 cups (8 ounces/227 grams) all purpose flour
• 1/2 teaspoon kosher salt
• 1/3 cup (3 1/2 ounces/125 grams) crunchy natural peanut butter, such as Adams, well mixed
• 2 large eggs at room temperature
• 2 tablespoons powdered sugar
• 1 cup plus 2 tablespoons (2 sticks plus 2 tablespoons/11 1/4 ounces/320 grams) unsalted butter, softened
• 1 teaspoon baking soda
• 1 teaspoon pure vanilla extract
• 2 tablespoons honey
• 2/3 cup (5 1/4 ounces/150 grams) packed brown sugar
• 3/4 cup (5 1/4 ounces/150 grams) granulated sugar
• 1 2/3 cups (5 1/4 ounces/99 grams) rolled oats, such as Quaker old fashioned