Heat oven to 350ºF. Generously spray bottoms and sides of 24 regular-size muffin cups with cooking spray. Place cookie mix in large bowl. Cut in butter and 4 oz cream cheese, using pastry blender or fork, until mixture is crumbly. (Do not overmix.) Reserve 1 cup cookie mixture for topping; set aside. Firmly press 2 tablespoons remaining cookie mixture evenly into bottom of each muffin cup.