Place a rack in the center of the oven. Heat the oven to 350° F.
Put the old-fashioned oats in a blender or food processor. Blend until the oats resemble a fine flour. Pulse in the baking soda and salt. Set aside.
1 cup (100 g) old fashioned oats, ½ tsp baking soda, ½ tsp salt
In a large mixing bowl, mix the peanut butter, melted butter, brown sugar, egg, honey, and vanilla until well combined.
½ cup (137 g) crunchy natural peanut butter, 2 TBS melted unsalted butter, ⅓ cup (90 g) packed brown sugar, 1 TBS (21 g) honey, 1 tsp vanilla, 1 egg, room temperature
Pour the dry ingredients in with the wet ingredients and mix until no dry oat flour remains.
Scoop the dough into balls about 2 tablespoons each in size. Place them on a parchment-lined baking sheet.
Use the tines of a fork to create a criss cross pattern on the top, pressing the cookies down into a 2" diameter. The dough will be sticky. Prevent the dough from sticking to the fork by getting the tines slightly wet.
Bake until the cookies are set around the edges and slightly soft in the center, about 10 minutes.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack. The cookies are best the day they are made!