Preheat and prep. Heat your oven to 350°F (175°C).
Line a 12-cup muffin tin with paper liners or lightly grease with oil.
Whisk the dry ingredients. In a large bowl, whisk 2 1/2 cups almond flour, 1 1/2 teaspoons baking powder, 1/2 teaspoon baking soda, 1 teaspoon cinnamon, and 1/4 teaspoon salt until evenly combined.
Mix the wet ingredients. In a separate bowl, whisk 3 large eggs, 1/3 cup maple syrup, 1/3 cup unsweetened applesauce, 1/4 cup oil, and 2 teaspoons vanilla extract until smooth.
Combine gently. Pour the wet mixture into the dry bowl. Stir with a spatula just until no dry spots remain. The batter will be thick and scoopable.
Fold in add-ins. If using, gently fold in 1 cup of blueberries, 1/2 cup dark chocolate chips, or 1/2 cup chopped nuts.
Don’t overmix.
Portion the batter. Divide the batter evenly among the 12 muffin cups. They can be filled almost to the top; almond flour doesn’t rise as dramatically as wheat flour.
Bake. Bake for 18–22 minutes, or until the tops are set and lightly golden and a toothpick comes out clean or with a few moist crumbs.
Cool. Let muffins cool in the pan for 5 minutes, then transfer to a rack to cool completely. This helps them set and prevents soggy bottoms.
Enjoy. Serve warm or at room temperature.
They pair well with coffee, tea, or a smear of almond butter.