In a large mixing bowl, combine 2 cups of rolled oats, 1 cup of creamy or crunchy peanut butter, ½ cup of honey (or maple syrup), ½ teaspoon of vanilla extract, and ¼ teaspoon of salt. Stir until cohesive and sticky (2–3 minutes).

Take about a tablespoon of the sticky mixture and roll it into a ball, then flatten it gently to form a cookie-shaped round, about 2 inches in diameter. Arrange the cookies on a parchment-lined tray, ensuring they don’t touch.

In a separate bowl, blend together the remaining peanut butter with ½ cup of powdered sugar until smooth and creamy (about 2 minutes).

Take one cookie round and generously spread a layer of the peanut butter filling on top. Place a second cookie on top, pressing it down gently to create a sandwich. Repeat with remaining cookie rounds and filling.

Once assembled, place the tray in the refrigerator for 30 to 60 minutes to chill and firm up the cookies and filling.