With an electric mixer combine butter and sugars. Blend until mixture is a light and fluffy texture dough. This should take a few minutes. Don't forget to scrap down the sides of the bowl after every couple of minutes.Add eggs, one at a time, and vanilla. Mix until light and fluffy.Add dry ingredients. I always add the flour one cup at a time. It's important to check your dough. Add flour until dough seems just right(not too sticky, not dry and crumbly). You may not need all three cups of flour. If the dough seems really sticky, add more flour, 1/4 cup at a timeUsing a cooking scoop(this ensures even-sized cookies), drop dough balls onto a parchment lined cookie sheet, one dozen cookies per cookie sheet. The perfect size cookie scoop for me is 1.5 ouches (you can find on amazon.Bake for 7 - 10 minutes (bake time depends on size of dough ballsCool and enjoy!makes 3 dozen