Preheat oven to 350°F. Line a 12 capacity standard muffin pan with cupcake liners.
Whisk all dry ingredients (first eight listed) in a large mixing bowl.
In a stand mixer (or use a hand mixer), blend the eggs and the 1.5 cup of pumpkin puree until smooth.
Add butter and sweetener and mix again.
Gradually add dry ingredients, mixing just until combined.
Pour batter into your prepared muffin pan.
Top with optional sugar-free chocolate chips or pumpkin seeds, if desired.
Bake 30-35 minutes or until a toothpick inserted in the center comes out clean.
Cool 15 minutes before removing.