01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a large bowl, whisk together almond flour, coconut flour, baking powder, baking soda, and salt until well combined.
03 - In a separate bowl, whisk Greek yogurt, eggs, honey or maple syrup, melted coconut oil or butter, and vanilla extract until smooth.
04 - Add wet ingredients to dry ingredients. Stir gently with a spatula until just combined—do not overmix.
05 - Fold in blueberries and lemon zest, distributing evenly throughout batter.
06 - Divide batter evenly among prepared muffin cups. Cups will be quite full.
07 - Bake for 22–26 minutes until tops are golden and a toothpick inserted into center comes out clean.
08 - Let muffins cool in tin for 5 minutes, then transfer to wire rack to cool completely.