Here's an excellent page with information about how to adjust a chocolate chip cookie recipe to achieve different results, such as chewier, crispier, fluffier, cakier, and so forth. Very handy.
My recipe is pretty simple. Start with:
1 cup sugar
1.5 cups brown sugar
1.25 cups butter
2 eggs
Mix that all together and then add:
1 tsp baking soda
1.5 tsp vanilla
pinch of nutmeg
pinch of cinnamon
pinch of salt
And gradually stir in:
3.5 cups of flour
12 oz of chocolate chips
Bake at 400 degrees for 9-10 minutes. I make large cookies, and this recipe comes out chewy and flat. Mmmmm.