Try this one. More like pumpkin pie fudge than just pumpkin fudge, but we quibble.
3 cups sugar
3/4 cup unsalted butter, melted
2/3 cup evaporated milk
1 cup canned pumpkin
2 Tbsp honey
2 1/2 tsp nutmeg
9 oz white chocolate, chopped
9 oz marshmallow creme or fluff
1 tsp vanilla extract
Mix together the first 6 ingredients and bring to a boil. Remove from heat. Then add in the chocolate and fluff and vanilla and stir until fully incorporated. Pour onto a baking sheet and let cool. Cut and serve.