Preheat oven to 375 degrees
cream together butter, brown sugar, and granulated sugar until fluffy--about 3 minutes.
Mix in eggs one at a time, mixing well after each addition
Stir in vanilla extract
whisk together remaining drying ingredients except for the oats in separate mixing bowl. Add in 1/3 increments to sugar/butter/egg mixture, mixing at medium-to-low speed after each addition.
Stir the oats one cup at a time into the dough. Use a wooden spoon rather than your mixer to maintain the integrity of oat flakes.
Place the 1/3 C granulated sugar for the coating in a small bowl. Form the dough into 1.5-2" balls, roll the balls in the sugar, and place on parchment or silicon lined cookie sheet.
Gently press each cookie down with a fork.
Bake for 8-10 minutes. Cool on the cookie sheet for at least 5 minutes after you remove them from the oven.
