Line an 8 X 8 glass dish with parchment paper.
Combine all ingredients in a large saucepan and place over medium-low heat on stove top.
Stir ingredients as they melt, and remove from heat once totally smooth and melted (this should only take a couple minutes).
Pour the fudge into your prepared dish and smooth top with a rubber spatula. It's ok if it doesn't reach the edges of the pan completely. It doesn't have to be perfect. ;)
Sprinkle nuts or sprinkles on top, if desired, and place in refrigerator for about an hour or so to set up.
Cut into small squares (this fudge is rich and a little goes a long way!) and serve. Store in an air-tight container or in the refrigerator if you prefer (though the texture will hold up at room temperature).