
Preheat the oven to 350°F. Line a muffin tin with liners and spray the inside with nonstick cooking spray.
In a large bowl, mix together mashed bananas, brown sugar (or coconut sugar), eggs, almond milk, and vanilla extract.
In a separate bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt.
Combine dry ingredients with wet ingredients and stir in melted coconut oil until just combined.
Divide batter; stir cocoa powder and ½ cup chocolate chips into half of the batter.
Spoon batters into muffin liners, alternating between banana and chocolate batter, and swirl together lightly.
Top with additional chocolate chips and bake for 18-25 minutes or until a tester comes out clean.
Cool in pan for 10 minutes before transferring to a wire rack. Sprinkle with flaky sea salt before serving.