I searched "jello nilla wafer banana cream pie" on google and this is the first hit, from recipesecrets.net
Easy Banana Cream Pie
Prep Time: 15 min
Total Time: 3 hr 15 min
Makes: 8 servings
2 medium ripe bananas, sliced
1 ready-to-use reduced fat graham cracker crumb crust (6 oz.)
2-1/2 cups cold fat free milk
2 pkg. (4-serving size each) JELL-O Vanilla Flavor Fat Free Sugar Free Instant Reduced Calorie Pudding & Pie Filling
2 cups thawed COOL WHIP FREE Whipped Topping, divided
PLACE half of the banana slices on bottom of crust. Set remaining banana slices aside.
POUR milk into large bowl. Add dry pudding mixes. Beat with wire whisk 2 min. or until well blended. Gently stir in 1 cup of the whipped topping. Spoon half of the pudding mixture into crust. Top with remaining banana slices; cover with remaining pudding mixture.
REFRIGERATE 3 hours or until set. Serve topped with the remaining 1 cup whipped topping. Store leftover pie in refrigerator.
Easy Chocolate Banana Cream Pie
Prepare as directed, using JELL-O Chocolate Flavor Fat Free Sugar Free Instant Reduced Calorie Pudding & Pie Filling.
The fourth hit contains this recipe for the Nilla wafer crust.
Nilla Wafer Crumb Crust
35-40 Nilla Wafers, finely crushed (about 1-1/4 cups)
1/4 cup (1/2 stick) butter or margarine, melted
2 Tbsp. sugar
Mix all ingredients until well blended. Press crumb mixture firmly onto bottom and up side of 9-inch pie plate. Bake at 350 for 6-8 minutes.