Preheat oven to 350°F. Line a baking sheet with parchment paper or a silicone baking mat. Set aside.
In a large mixing bowl add the butter, beat until smooth and creamy. Add the light brown sugar and mix until combined and fluffy.
Add the eggs one at a time, mixing in between. Add in the sour cream and maple syrup, mix until completely combined.
In a medium size bowl combine the flour, salt and baking soda. Stir with a fork. Then slowly pour the dry ingredients into the wet ingredients, slowly mixing until just combined.
Using a cookie scoop or spoon, spoon about 2 tablespoons of the cookie dough onto the baking sheet.
Bake for about 12 minutes until the cookies are turning golden on the edges. Remove from the oven and allow to cool on the pan for about 3-4 minutes, then remove to continue cooling on a wire rack. Repeat this process until all the cookie dough has been baked. This will make about 3 dozen cookies.
Once the cookies are cooled prepare the frosting.