Preheat and prep: Heat your oven to 350°F (175°C). Line a 12-cup muffin pan with parchment liners or grease well.
Mix dry ingredients: In a large bowl, whisk together 2 cups almond flour, 2 tablespoons coconut flour, 1/2 to 2/3 cup granulated erythritol or monk fruit blend, 2 teaspoons ground cinnamon, 2 teaspoons baking powder, and 1/4 teaspoon salt.
Break up any clumps.
Whisk wet ingredients: In a separate bowl, whisk 3 large eggs, 1/2 cup unsweetened almond milk, 1/3 cup melted butter, and 1 teaspoon vanilla extract until smooth.
Combine: Pour the wet ingredients into the dry. Stir gently until just combined. The batter will be thick but scoopable.
If it’s too thick, add 1–2 teaspoons more almond milk.
Optional add-ins: Fold in 1/3 cup chopped pecans or sugar-free chocolate chips for extra texture.
Portion: Divide the batter evenly among the muffin cups, filling each about 3/4 full. Smooth the tops with a spoon for an even rise.
Bake: Bake 16–20 minutes, or until the tops are golden and a toothpick comes out mostly clean with a few moist crumbs.
Cool: Let muffins cool in the pan for 5 minutes, then transfer to a rack. This helps set the structure and prevents crumbling.
Optional glaze: Mix 1/3 cup powdered erythritol with 1–2 tablespoons almond milk and a pinch of cinnamon.
Drizzle over cooled muffins.