Step 1: Prepare the Fudge Base

1. In a medium saucepan, combine 2 cups of granulated sugar, 4 ounces of unsalted butter, and ½ cup of heavy cream.
2. Heat the mixture over medium heat, stirring continuously until the butter melts and the mixture starts to simmer.
3. Continue cooking for 4–5 minutes, stirring occasionally to ensure the sugar dissolves completely.
4. Remove the saucepan from the heat. Immediately stir in 2 cups of white chocolate chips and 1 (7 oz) container of marshmallow creme. Mix until smooth and creamy.

Step 2: Flavor the Fudge

1. Add 3 tablespoons of vanilla instant pudding mix, ½ teaspoon of vanilla extract, and 3 tablespoons of unsweetened cocoa powder to the fudge mixture.
2. Stir thoroughly until all the ingredients are fully combined, creating a rich and flavorful base.

Step 3: Pour and Set the Fudge Layer

1. Line an 8×8-inch square pan with parchment paper, leaving an overhang for easy removal later.
2. Pour the fudge mixture into the prepared pan. Use a spatula or the back of a spoon to smooth the surface evenly.
3. Tap the pan lightly on the countertop to remove any air bubbles.

Step 4: Make the Chocolate Topping

1. In a microwave-safe bowl, combine 6 ounces of semisweet chocolate chips and 1 tablespoon of vegetable oil.
2. Heat in 20-second bursts in the microwave, stirring between each interval, until the chocolate is fully melted and smooth.
3. Pour the melted chocolate over the fudge base, spreading it evenly with a spatula or spoon to cover the entire surface.

Step 5: Chill and Set

1. Let the fudge cool at room temperature for 15–20 minutes before placing it in the refrigerator.
2. Refrigerate the fudge for at least 4 hours, or until it is fully set and firm.

Step 6: Slice and Serve

1. Once the fudge is set, lift it out of the pan using the parchment paper overhang.
2. Place the fudge on a cutting board and use a sharp knife to cut it into small squares or rectangles.
3. Serve immediately or store in an airtight container for later.