01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup with coconut oil or butter.
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 emulsified.
04 - Pour the wet ingredients into the dry ingredients. Using a spatula, fold gently until just combined. The batter will be thick—avoid overmixing to prevent dense muffins.
05 - Gently fold in the blueberries and lemon zest, distributing evenly throughout the batter. If using frozen berries, add them directly from the freezer without thawing.
06 - Divide the batter evenly among the 12 prepared muffin cups. Fill each cup nearly to the top, as these muffins have a nice dome and don't rise excessively.
07 - Bake for 22 to 26 minutes, or until the tops are golden brown and a toothpick inserted into the center of a muffin comes out clean or with a few moist crumbs.
08 - Let the muffins cool in the tin for 5 minutes before transferring to a wire rack to cool completely. This helps set the structure and makes them easier to remove.