Preheat oven to 350°F (175°C). Line 6 muffin cups with liners or foil, greasing well with avocado oil.
Mix eggs, pumpkin, melted butter, stevia, vanilla, and cinnamon until smooth.
Gradually add coconut flour, mixing thoroughly to avoid lumps. Stir in baking powder.
Divide batter evenly into muffin cups using a 4-tbsp scoop.
Bake for 22-25 minutes until set and a toothpick comes out clean. Cool on a rack completely before frosting.
For frosting, blend cream cheese, pumpkin, stevia, cinnamon, and vanilla until smooth. Chill briefly, then pipe or spread on cooled muffins. Serve immediately or refrigerate.
Notes
Feel free to adjust sweetness or spices to taste. These muffins are best enjoyed fresh but can be stored in the fridge for a few days.