Step 1: Prepare the Oreo Mixture
1. Crush Oreos: In a food processor, crush the Oreo cookies into fine crumbs. You can also place them in a zip-top bag and crush them with a rolling pin.
2. Mix Ingredients: In a large bowl, combine the crushed Oreos, softened cream cheese, and peanut butter. Mix until well combined and smooth.
3. Add Sugar: Gradually add the powdered sugar, mixing until fully incorporated. The mixture should be thick and hold together well.

Step 2: Form the Balls
1. Shape Balls: Use a cookie scoop or your hands to form the mixture into 1-inch balls. Place them on a baking sheet lined with parchment paper.
2. Chill: Refrigerate the balls for about 30 minutes, or until firm.

Step 3: Coat the Balls
1. Melt Chocolate: In a microwave-safe bowl, melt the chocolate chips in 30-second intervals, stirring in between, until smooth. If desired, stir in the vegetable oil to help the chocolate coat more smoothly.
2. Coat Balls: Dip each chilled Oreo ball into the melted chocolate, using a fork to help coat them evenly. Allow any excess chocolate to drip off.
3. Set on Baking Sheet: Place the coated balls back on the parchment-lined baking sheet.

Step 4: Garnish and Chill
1. Garnish: If desired, sprinkle crushed Oreos or chopped peanuts on top of the chocolate before it sets.
2. Chill Again: Refrigerate the coated Oreo balls for at least 30 minutes to allow the chocolate to harden.