Preheat oven to 400 degrees F.
In a large mixing bowl, combine flour, salt, baking powder, baking soda, and zest of 1 lemon. Mix well.
In a separate bowl, combine milk, egg, vanilla, maple syrup, olive oil, and lemon juice. Mix well.
Add wet ingredients to dry ingredients and mix until just combined.
Add poppy seeds and fold into the mixture.
Prepare a 12 cup muffin tin and scoop the mixture evenly in all 12 cups.
Bake for 15 minutes.
After baking, remove muffins and place on a cooling rack.