Step 1

Line an 8x8 pan with foil or parchment, allowing some to hang over the edges for easy removal later

Step 2

In a heavy bottomed saucepan, combine the half and half, sugar, salt and butter. Heat over medium, stirring until the butter has melted and the sugar has dissolved.

Step 3

Continue heating until the mixture comes to a full rolling boil (bubbles over the top of the entire surface)

Step 4

Continue to boil for 8-10 minutes, stirring VERY occasionally to prevent sticking/burning until a candy thermometer reads between 234F and 236F.

Step 5

Immediately remove the pan from the heat, and stir in the marshmallows, peanut butter, and vanilla extract. Stir until smooth.

Step 6

Pour the fudge out into the lined pan, and allow it to cool overnight or for at least 4 hours before cutting into 1 inch squares.