Lightly spray a 9-inch springform pan with non-stick cooking spray.
Combine the crushed animal cookies and melted butter in a bowl until evenly coated.
Firmly press the mixture into the bottom of the prepared pan to form the crust.
In a separate bowl, whip the heavy cream until stiff peaks form. Set aside.
Beat together the cream cheese, lemon juice, and marshmallow fluff until smooth and creamy.
Gently fold the whipped cream into the cream cheese mixture until fully combined. This creates the signature fluffy texture of this No Bake Marshmallow Cheesecake.
Spread the filling evenly over the prepared crust.
Refrigerate for at least 3 hours or until fully set.
Carefully remove the cheesecake from the springform pan.
Decorate with sprinkles, marshmallow Peeps, and jelly beans before serving.