For the cookies, in mixing bowl combine all the dry ingredients except the rolled oats.

In separate large bowl, beat the butter with the sugar until creamy. Add the vanilla extract and the eggs, one at a time and beat after each egg. Continue to beat on low until incorporated (less than a minute).

Stir in the oats. If you'd like to add raisins you would add them at this time.

Drop rounded tablespoons on a parchment paper lined cookie sheet and bake at 350 degrees F for 10 minutes. Turn the pan around and bake for another five minutes or until light golden brown.

Let cool completely on rack.

To assemble ice cream sandwich, put a big scoop of ice cream on flat side of one cookie. You can push it down with your hand (covered with a little plastic wrap or paper towel so your hand doesn't get ice cream on it).

Put another cookie on the top and roll the sides in the chocolate chips. Serve immediately or put individually in freezer.