Prepare the filling: In a medium mixing bowl, use a hand mixer to beat the softened cream cheese, granulated sugar, and peanut butter together until the mixture is completely smooth and creamy, about 1–2 minutes.
Fold in the whipped topping: Gently fold the thawed Cool Whip into the cream cheese mixture using a rubber spatula. Stir just until no white streaks remain and the filling is uniform.
Fill the crust: Spoon the peanut butter filling into the prepared Oreo crust. Spread it evenly with the spatula, smoothing the top.
Warm the fudge: Place the hot fudge sauce in a microwave-safe bowl. Microwave on high for 30–45 seconds until warm and pourable.
Create the swirl: Drizzle the warm fudge sauce over the top of the filling in a zigzag or circular pattern. Use a toothpick or the tip of a knife to gently swirl the fudge across the surface. Do not press deep into the filling; keep the swirling on the top layer only.
Chill the pie: Cover the pie with the plastic lid that came with the crust, or with plastic wrap. Refrigerate for at least 8 hours, or overnight, to allow the filling to set completely.
Serve: Slice the chilled pie and serve directly from the refrigerator. For extra fudge flavor, drizzle additional warm hot fudge sauce over each slice before serving.
No Bake Peanut Butter Fudge Swirl Pie
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