In a large bowl, mix together the peanut butter, melted coconut oil, and sugar-free syrup until smooth.
Add the oat flour and protein powder, stirring until everything is well combined. The mixture should be thick and dough-like.
Press the peanut butter mixture evenly into a lined 8×8-inch pan. Use a spatula or your hands to smooth the top.
2. Make the Chocolate Layer:
In a microwave-safe bowl, combine the dark chocolate chips and coconut oil. Heat in 30-second intervals, stirring between each, until the chocolate is fully melted and smooth.
Pour the melted chocolate over the peanut butter layer, spreading it evenly with a spatula.
3. Chill and Set:
Place the pan in the refrigerator for at least 1-2 hours, or until the bars are firm and the chocolate layer has set.
Once set, remove from the fridge and cut into bars or squares.
4. Store and Enjoy:
Store the bars in an airtight container in the fridge for up to a week, or freeze for longer storage. Enjoy straight from the fridge or let them sit at room temperature for a few minutes before eating for a softer texture.