Preheat the oven to 350F and line a muffin tin with muffin liners and spray with cooking spray.
In a small bowl, mix almond flour, coconut flour, baking powder, baking soda, and salt.
In a large bowl, whisk three eggs.
Stir in coconut oil, maple syrup, almond milk, vanilla, and lemon juice.
Add dry ingredients to wet ingredients until completely combined.
Stir in poppy seeds and lemon zest, then pour into muffin pan.
Place in the oven and bake for 25-30 minutes, or until a toothpick comes out clean.
While baking, prepare glaze by whisking together powdered sugar, almond milk, and lemon juice.
Let muffins cool completely before glazing.