1. Line an 8×8-inch baking dish with parchment paper, leaving an overhang for easy removal.

2. In a medium saucepan over low heat, combine the white chocolate chips, sweetened condensed milk, and butter.

3. Stir continuously until the mixture is completely smooth and melted.

4. Remove from the heat and stir in the orange extract, orange zest, and food coloring if using.

5. Fold in the mini marshmallows, distributing them evenly throughout the mixture.

6. Pour the fudge mixture into the prepared baking dish and spread it evenly with a spatula.

7. Refrigerate for at least 3 hours, or until firm and fully set.

8. Lift the fudge from the pan using the parchment paper and cut into small squares.

9. Store in an airtight container in the refrigerator for best texture and freshness.