01 - Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large mixing bowl, blend rolled oats, almond flour, cocoa powder, sea salt, and baking powder thoroughly.
03 - Whisk melted coconut oil, maple syrup, brown sugar, eggs, and vanilla extract in a separate medium bowl until smooth.
04 - Pour wet ingredients into the dry mixture and stir gently until combined, avoiding overmixing.
05 - Fold in dark chocolate chips and nuts, if using, until evenly distributed throughout the batter.
06 - Spoon the batter evenly into prepared muffin cups, filling each about three-fourths full.
07 - Bake in the preheated oven for 18 to 20 minutes, or until centers are set and a toothpick inserted comes out with a few moist crumbs or melted chocolate streaks.
08 - Allow oatmeal cups to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before serving.