Preheat oven to 350 degrees and line a baking sheet with silicone mats or parchment paper.
Add cut up butter into the mixer and beat until the butter has softened and is somewhat smooth.
Add in the brown sugar and mix until well mixed. Do not over mix!
Add the egg, molasses, and vanilla and mix until well combined. Do not over mix!
In a separate bowl, sift together the dry ingredients and mix until well combined.
Add dry ingredients to the butter/brown sugar mixture. Pulse mixer or mix on LOW until dry and wet ingredients are combined. Use a spatula to scrape side of bowl as needed.
Using a cookie scoop, or weighing dough balls to 2 ounces (small cookies, 4 ounces for large cookies) place cookies 2-3 inches apart. Bake for 10-12 minutes. I would recommend checking at 10 minutes to see if your cookies are done or not. Cookies will be done when the tops are slightly browned and are cracking.
Let your cookies finish baking on the hot cookie sheet and do not disturb them until they are completely cooled!