Set the oven to 350°F (175°C). Grease a 9-inch pie plate with nonstick cooking spray or butter. Set aside.
In a medium mixing bowl, use an electric mixer on low speed to beat the egg whites until foamy. Gradually incorporate the sugar while continuing to beat. Increase the speed to high and continue mixing until stiff peaks form and the mixture is glossy.
Gently fold in the crushed Ritz crackers, chopped pecans, and vanilla extract into the whipped egg white mixture. Take care not to deflate the meringue.
Spread the mixture evenly into the prepared pie plate. Bake for 25–30 minutes, or until the top is lightly golden and set.
Allow the pie to cool completely at room temperature. Once cooled, top with the thawed whipped topping. The pie may be served immediately or chilled in the refrigerator for a few hours before serving.
Notes
For best results, ensure your egg whites are at room temperature before beating. Chilling the pie for a few hours enhances its texture and makes it easier to slice.