Start by creaming together the butter and sugars. If using a hand mixer, remember this part takes twice as long as using a stand mixer. If you think it's creamy enough, it probably isn't. A good indicator apart from fluffiness is the color should be come noticeably whiter.
Add the egg and vanilla and mix for a few minutes more. In a separate bowl (although not totally necessary) mix together the dry ingredients. Mix into the butter mixture until just incorporated. Fold in the chocolate chips and raisinets with a rubber spatula. Refrigerate for at least an hour.
When ready to bake, preheat the oven to 375. Do not bake immediately out of the fridge. Give the dough a bit of time to get soft again so it can spread. If you bake it immediately, the cookie doesn't spread as well, so they end up smaller and thicker. If you are into that though, go for it! Bake for 9 minutes.
Recipe by A Sue Chef at http://www.asuechef.com/oatmeal-raisinet-chip-cookies/