In a mixer, beat egg whites and cream of tartar until stiff. Take mixing bowl off of mixer and continue by hand. Add sugar, nuts, and crushed Ritz crackers (you can crush them in a Ziploc bag using a rolling pin). Stir everything with a spoon.
Grease a 9 x 13 x 2 cake pan. Pour the batter into the cake pan and smooth it out. Bake at 325 degrees for 25 minutes. Let it cool.
While the cake is cooling, make Dream Whip according to package directions. Pour the Dream Whip over the cooled cake. Add the cherry pie filling over the top of the Dream Whip. Refrigerate overnight before serving.