Prep your pan: Heat the oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or lightly grease with butter or coconut oil.
Mix dry ingredients: In a large bowl, whisk together almond flour, coconut flour, sweetener, baking powder, baking soda, salt, and cinnamon until no lumps remain.
Combine wet ingredients: In a separate bowl or measuring cup, whisk eggs, melted butter, almond milk, vanilla, and maple extract.
If using heavy cream, add it here.
Bring it together: Pour the wet mixture into the dry. Stir with a spatula until just combined. The batter should be thick but scoopable.
If it seems dry, add 1–2 teaspoons more almond milk.
Fold in pecans: Gently fold in the chopped pecans, reserving a tablespoon or two for topping.
Fill the cups: Divide batter evenly among the 12 muffin wells. Sprinkle reserved pecans on top and lightly press them in.
Bake: Bake for 18–22 minutes, or until the tops are set and a toothpick comes out clean or with a few moist crumbs. Avoid overbaking to keep them tender.
Cool: Let muffins cool in the pan for 5 minutes, then transfer to a rack to cool completely.
They firm up as they cool.
Serve: Enjoy warm with butter, or let them rest for peak flavor and crumb.