Preheat your oven to 350°F (175°C). This ensures that your cookies bake evenly and come out perfectly chewy.
In a large mixing bowl, combine the peanut butter, eggs, maple syrup, avocado oil, and vanilla extract. Use a spatula or whisk to mix until smooth and creamy.
To the wet mixture, add the oats, cocoa powder, baking powder, cinnamon (if using), and sea salt. Stir until fully combined.
Gently fold in the chocolate chips until evenly distributed throughout the cookie dough.
Using a tablespoon or cookie scoop, drop rounded balls of dough onto your prepared baking sheet, leaving space between each cookie as they will spread slightly during baking.
Bake in the preheated oven for 10-12 minutes, or until the edges look set but the centers are still soft.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy your Flourless Double Chocolate Peanut Butter Oatmeal Cookies warm or at room temperature!