Soften the dairy base. Let cream cheese sit at room temperature for 20–30 minutes so it blends smoothly without lumps.
Mix the base and sweetener. In a bowl, beat cream cheese with sweetened condensed milk or powdered sugar until silky. Aim for a smooth, thick mixture.
Add your flavor booster. Stir in lemon juice for tang, peanut butter for richness, instant pudding mix for chocolate or vanilla, or fruit puree for a bright twist. Mix until fully combined.
Fold in the whipped component. Gently fold in whipped topping or softly whipped cream. Do not overmix; you want to keep the air for a light, mousse-like texture.
Fill the crust. Spoon the mixture into your ready-made crust and smooth the top.
Tap the pie lightly on the counter to settle any air pockets.
Chill to set. Cover and refrigerate for at least 4 hours, preferably overnight. This step firms the filling and helps it slice neatly.
Garnish and serve. Before serving, add simple toppings: lemon zest, crushed cookies, chocolate shavings, chopped peanuts, or fresh berries. Slice with a warm, dry knife for clean cuts.