Preheat your oven to 350°F.
Step 1
Whisk together the flour, baking soda, and salt in a small bowl. Set this aside for later.
Step 2
In a larger bowl, cream the softened butter, brown sugar, and granulated sugar until the mixture is smooth and creamy.
STEP 3
Add the egg and vanilla extract to the creamed sugars and beat until the mixture is light and fluffy.
STEP 4