Pink Lemonade Freezer Bars

sleeves Ritz crackers (about 120 crackers, 40 per sleeve), about 3 cups crumbs

heaping cup confectioners’ sugar

unsalted butter, melted (1 1/2 sticks)

pink lemonade concentrate, thawed to liquid

sweetened condensed milk

 Cool Whip Whipped Topping, thawed to room temperature

red or pink food coloring, optional (I used about one dozen drops of red food coloring)