Pre-heat oven to 350 degrees.
In a bowl, mix flour, baking soda, cinnamon, nutmeg, and salt; set aside.
In a larger bowl, cream together butter, white sugar, and brown sugar until fluffy. Add eggs one at a time then add vanilla. Scrape down sides of bowl and mix for a few seconds more.
Next add the flour mixture a little at a time until incorporated. Finally, mix in oats and raisins.
If you are baking right away, measure out 3-4 tablespoons of dough, roll in a ball and flatten a little. Bake for 10-12 minutes. If you are waiting, wrap dough in saran wrap and chill in refrigerator overnight. When you are ready to bake, let dough sit out for about 30 minutes then measure out and bake cookies for 10-12 minutes.
