Preheat oven to 350 degrees F.
In a large bowl or mixer, cream butter and sugars together and then mix in eggs and vanilla.
Add dry ingredients to butter mixture until combined.
Chill dough about 20 mins in the fridge.
Mix 3 Tbsp sugar and 3 Tbsp cinnamon together in small bowl.
Scoop 1.5 inch balls of chilled dough and roll them into sugar/cinnamon mixture. Gently press dough down a little with thumb for PERFECT cookies!
Bake 10-12 mins. Cool on wire racks.