01 - Preheat your oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with cooking spray.
02 - In a large mixing bowl, add the oats, almond flour, cocoa powder, sea salt, and baking powder. Mix thoroughly until evenly distributed.
03 - In a separate medium bowl, whisk together the melted coconut oil, maple syrup, brown sugar, eggs, and vanilla extract. Continue whisking until the mixture is smooth and fully incorporated.
04 - Pour the wet ingredients into the dry bowl. Stir gently with a spatula until just combined, being careful not to overmix.
05 - Add the dark chocolate chips and chopped nuts if using. Fold them gently into the batter until evenly distributed.
06 - Divide the batter evenly among the prepared muffin cups, filling each about three-quarters full.
07 - Bake for 18 to 20 minutes. The centers should be set and a toothpick inserted should come out mostly clean with a few moist chocolate streaks.
08 - Allow the cups to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before serving.