Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking pan.
In a medium bowl, cream together the butter and sugars until light. Beat in the eggs one at a time, then stir in the vanilla. Combine the flour, baking soda, salt, cinnamon, nutmeg, and cloves; stir into the creamed mixture. Mix in the chocolate chips, almonds, and walnuts.
Spread the dough evenly into the prepared pan. Bake for 25 to 30 minutes in the preheated oven, or until the bars begin to turn golden brown. Allow to cool before cutting into bars.
Interesting Facts
Cowboy cookie bars are a great way to use up any leftover nuts and chocolate chips.
These bars can be stored in an airtight container for up to a week.
Adding a bit of espresso powder to the batter can add a subtle depth of flavor.