Preheat the oven to 350°F (175°C). Line a baking sheet with parchment or a silicone liner.
Add the peanut butter, sugar, applesauce, and vanilla to a medium mixing bowl, and mix until combined. Add the oats to a food processor or blender and pulse for about 30 seconds, until crumbly. Add the oats, baking soda, and salt to the peanut butter mixture, and stir gently to combine.
Scoop the cookie dough onto the prepared baking sheet, pressing each ball of dough down gently with a fork. Bake for 8-10 minutes, until lightly browned.
Notes
To STORE Healthy Peanut Butter Cookies, keep them in an airtight container at room temperature for up to one week. For longer storage, FREEZE the cookies in a single layer on a baking sheet, then transfer them to a freezer-safe bag or container for up to 3 months.To REHEAT, microwave frozen cookies for 10-15 seconds or warm them in a 350°F (175°C) oven for 5-7 minutes.