Preheat your oven to 350 F
In a large bowl whisk together the egg, sugar, coconut oil, peanut butter and vanilla extract until smooth and creamy
Add in your oat flour, baking soda, salt and chocolate chunks and mix well until evenly incorporated.
Line a baking sheet with parchment paper, and scoop out 2 tbsp of cookie dough about 1u0022 apart from eachother.
Bake for 10 minutes and remove from oven. Press 2 chopped pieces of peanut butter cups into the top of the cookie right when they come out of the oven.
Turn the oven off and place the tray back into the oven for 30 seconds, to let the peanut butter cups melt slightly.
Remove from oven and let cool for 10 minutes.
Keep stored in airtight container for up 4-5 days, or refrigerate for up to 1 week.