In large bowl, beat egg whites until slightly stiff. Gradually add sugar and cream of tartar and continue to beat. Add vanilla and salt and continue beating until whites stand in stiff peaks. Spray 9 x 9- inch glass baking dish with non-stick cooking spray. Spread meringue over entire bottom and sides of dish to form a crust. Bake in 300 degrees Fahrenheit oven for 45 minutes. Remove and cool.
After crust has cooled, prepare pudding mix according to package directions and fold in sliced bananas. Pour pudding mixture into crust and sprinkle ground graham crackers on top. Chill and serve.