Blueberry Yum Yum
["1 (10 oz.) pkg. Lorna Doone cookies, crushed (reserve 3/4 cup for topping)", "1/4 c. butter"]
["Cut butter into cookie crumbs and mix well.", "Press into large glass baking dish.", "Bake in 350\u00b0 oven for 5 minutes."]
["Lorna Doone cookies", "butter"]