Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the almond flour, baking soda, and sea salt to ensure even distribution and removal of clumps.
In a separate medium bowl, whisk the egg, maple syrup, melted coconut oil, lemon zest, lemon juice, and vanilla extract until fully emulsified.
Incorporate the wet ingredients into the dry ingredients using a spatula, folding until a uniform, thick dough forms.
Divide the dough into 1-tablespoon portions and roll into spheres, placing them approximately 2 inches apart on the prepared baking sheet.
Gently press down on each sphere with the palm of your hand or a fork to flatten into a disk shape roughly 1/2 inch thick.
Bake for 10 to 12 minutes, or until the edges are lightly golden brown while the centers remain soft.
Remove from the oven and allow cookies to cool on the baking sheet for 10 minutes to stabilize before transferring to a wire cooling rack.