1. Place butter in 2 qt microwaveable round dish at least 2 inches deep. Microwave on high 30 sec. Or until melted. Add 1/2 cup graham crumbs, 1/3 cup sugar, nuts and 1 tsp cinnamon; mix well. Set aside.
2. Beat eggs in large bowl with wire whisk. Add cool whip, remaining graham cracker crumbs, sugar and cinnamon; stir just until blended. Spread over crumb mixture in dish.
3. Microwave on medium 9-10 mins or until cake starts to pull away from side of dish, turning dish after 5 mins. Place serving plate on top dish; invert cake. Remove dish. Sprinkle any crumbs remaining on bottom of dish over cake. Fluff crumb topping with fork. Serve immediately.