Preheat oven to 350°F (175°C). Line a muffin tin with paper liners.
In a large bowl, mix almond flour, coconut flour, sugar, poppy seeds, baking powder, baking soda, and salt.
In another bowl, whisk eggs, Greek yogurt, melted coconut oil, lemon juice, lemon zest, and vanilla extract.
Combine wet and dry ingredients, stirring until just mixed.
Divide batter evenly among muffin cups.
Bake for 20 minutes or until a toothpick inserted into the center comes out clean.
Let cool before serving.