To make Hello Dolly Bars, first line the bottom and sides of a 9-inch square baking pan with parchment paper. Cut off any excess parchment paper around top edge of the pan.
Place graham cracker crumbs in a medium bowl. Drizzle with butter and one tablespoon of water; and toss with a fork until moist. Gently pat the mixture into an even layer in the pan. Do not press firmly.
Sprinkle chocolate chips and butterscotch morsels over the crumb mixture. Top evenly with coconut and pecans. Drizzle milk evenly over top. Place in a preheated oven and bake at 350° for 25 minutes or until lightly browned and bubbly around edges.
Cool completely on a wire rack.
To cut into bars, carefully lift the parchment paper out of the pan and place on a cutting board. Fold down the edges of the paper and cut into squares.