Preheat standard oven to 425°F. Adjust rack to lowest position.
Line 9-inch pie plate with pie crust.
Combine sugar, 3-1/2 oz. of the flour, lemon zest, cinnamon and 1/8 tsp. of the salt. Stir in peaches and vanilla. Place mixture in crust.
Bake 30 min.
Combine chopped wafers, remaining 1-3/4 oz. flour, baking powder and remaining 1/8 tsp. salt. Add butter; mix until evenly blended.
Remove pie from oven. Reduce oven temperature to 375°F. Sprinkle Topping over Filling. Return pie to oven; bake 30 min.
Cool at least 1 hour before serving.