1. Crust and cheesecakes. Line 16 indents of 2 cupcake pans with foil liners. Coat liners with nonstick spray. Place 1 Nilla wafer in bottom of each prepared cup.
2. Sprinkle gelatin over 1/4 cup water in a glass measuring cup and let soak for 1 minute. Microwave 30 seconds to dissolve.
3. Beat cream cheese and sugar in a large bowl until smooth. Beat in vanilla, then fold in whipped topping or whipped cream. While beating over medium speed, add dissolved gelatin in thin stream. Fold in mini chips. Spoon 1/4 cup batter into each prepared cup, smoothing tops.
4. Spiderwebs. Combine chips and oil in a microwave-safe bowl. Microwave 1 minute and stir until smooth. Transfer to a resealable plastic bag or piping bag. Snip off a small corner and pipe in a spiral pattern on each cake. Starting at the center, run a thin knife through each spiral to resemble a spiderweb. Refrigerate at least 4 hours.