Preheat oven to 350 degrees and line baking sheets with parchment paper.
In a large bowl, cream butter and sugars until smooth.
Add maple syrup, baking soda, cream of tartar, and sea salt and stir to combine.
Add egg and vanilla extract and mix well.
Add flour, half at a time, and mix until fully combined.
Scoop dough onto baking sheets using a 1 TBS cookie scoop.
Bake for 12 minutes, rotating halfway through.
Let cookies cool completely on the cookie sheets.
While cookies are cooling, in a small bowl whisk together all ingredients until smooth.
When cookies are cool, drizzle glaze over the top of each cookie
Transfer cookies to a wire rack to harden.
Store in an airtight container.