Preheat your oven to 350 F. Line a baking sheet tray with parchment paper.
Add the softened butter and brown sugar to a mixing bowl and beat with an electric mixer until light and fluffy.
½ cup butter, softened, 1 cup brown sugar
Add the egg and vanilla extract and mix until the batter is smooth.
1 egg, 1 teaspoon vanilla extract
Add the flour, cornstarch, baking soda, and salt to the bowl and stir into a thick, smooth batter.
1 ¼ cup all purpose flour, ½ teaspoon cornstarch, ½ teaspoon baking soda, ¼ teaspoon sea salt
Stir in the shredded coconut.
1 ⅓ cup unsweetened shredded coconut
Scoop the cookie dough into two tablespoon-sized balls and place on the parchment-lined cookie sheet.
Bake the cookies for 10-12 minutes. The edges should be just turning golden brown and the coconut on top will look a little toasted. The tops of the cookies should also look set and not shiny.
Let the cookies cool on a wire rack then enjoy!