01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with cooking spray.
02 - In a large bowl, mix together oats, almond flour, cocoa powder, sea salt, and baking powder until well blended.
03 - In a separate medium bowl, whisk melted coconut oil, maple syrup, brown sugar, eggs, and vanilla extract until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Stir gently with a spatula just until combined, being careful not to overmix.
05 - Gently fold in dark chocolate chips and chopped nuts, if using, until evenly distributed throughout the batter.
06 - Divide batter evenly among prepared muffin cups, filling each about 3/4 full.
07 - Bake for 18-20 minutes until centers are set and a toothpick inserted comes out mostly clean with a few moist chocolate streaks.
08 - Let cool in pan for 10 minutes, then transfer to wire rack to cool completely before serving.