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 blended.
03 - In a separate medium 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—be careful not to overmix as this can make muffins dense.
05 - Gently fold in the blueberries and lemon zest, distributing them evenly throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each cup nearly to the top.
07 - Bake for 22 to 26 minutes, or until the tops are golden brown and a toothpick inserted into the center comes out clean.
08 - Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely before serving.