01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup with cooking spray.
02 - In a large bowl, whisk together almond flour, coconut flour, baking powder, baking soda, and salt until thoroughly combined.
03 - In a separate bowl, whisk the Greek yogurt, eggs, honey or maple syrup, melted coconut oil or butter, and vanilla extract until smooth and creamy.
04 - Pour the wet ingredients into the dry ingredients. Using a spatula, fold gently until just combined—avoid overmixing to prevent dense muffins.
05 - Gently fold in the blueberries and lemon zest until evenly distributed throughout the batter.
06 - Divide the batter evenly among the 12 prepared muffin cups. Fill each cup nearly to the top as the muffins will rise slightly.
07 - Bake for 22 to 26 minutes, or until muffin tops are golden brown and a toothpick inserted into the center comes out clean.
08 - Allow muffins to rest in the tin for 5 minutes before transferring to a wire rack. Cool completely before storing.