2. Add butter, stir until mixture is well blended and forms coarse crumbs. Reserve 1/2 (about 2 1/4 cups) for the topping.
6. Microwave caramels and milk in medium microwaveable bowl on high 2-3 minutes or until caramels are completely melted, stirring after every minute. Let stand one minute (not any longer than that, will start to harden and can't spread it well).