Preheat oven to 350 degrees F and line 2 large baking sheets with unbleached parchment paper.
In a large bowl, add butter and sugar and using an electric hand mixer or stand mixer blend until creamy. Add the egg, vanilla extract, baking soda, salt, lemon zest and juice; blend another minute. Add almond flour, stir with spatula until cookie dough forms and refrigerate for 30 minutes.
Using a small scoop, scoop dough, roll into a ball, place on previously prepared baking sheet and gently press with fingers to flatten cookies a bit. Cookies spread somewhat, so leave 1.5 inch in between. Repeat with remaining dough.
Bake on a middle rack for 12 minutes. Remove from the oven and let cool for 10 minutes.
While cookies are cooling, make glaze by whisking powdered sugar and lemon juice in a small bowl. Drizzle over cookies and enjoy!
Notes
Store: In a cookie jar for up to 5 days.
Freeze: In an airtight container for up to 3 months. Thaw on the counter for a few hours.