easy rocky road fudge

8 tablespoons unsalted butter
4 cups sugar
1 12ounce can evaporated milk
1 teaspoon vanilla extract
2 12 ounce packages chocolate chips
1 pound salted mixed nuts, chopped
2 cups marshmallow creme

1. generously coat a 13 by 9 inch baking dish with non stick cooking spray
2. in a medium saucepan over medium heat, combine the butter, sugar, evaporated milk, and vanilla.
3. stirring constantly, bring to a low boil, and cook for about 6 minutes.
4. stir in the chocolate chips until melted, then stir in the nuts.
5. add the marshmallow creme, and stir until just combined.
6. pour fudge into the baking dish and let cool, about 2 hours, then cut into chunks.
7. store in an airtight container for up to a week.