Preheat oven to 350°F (175°C). Line a 12-cup muffin pan with parchment liners or lightly grease.
Mix wet ingredients. In a large bowl, whisk together eggs, maple syrup, melted coconut oil, and vanilla extract.
Add dry ingredients. Stir in almond flour, baking powder, salt, and lemon zest until smooth.
Fold in blueberries. Gently fold in blueberries. If using frozen, toss them in a teaspoon of almond flour first.
Fill muffin cups. Divide batter evenly into the muffin pan, about ¾ full for each.
Bake. Bake for 22–26 minutes, until tops are golden and a toothpick comes out clean.
Cool. Let muffins cool for at least 10 minutes before serving.