Step 1

Spray a 9-inch square pan with baking spray and line with parchment paper, so that there is overhang on both sides (for easy lifting). The baking spray is optional, but helps the paper stick better.

Step 2

In a large saucepan over medium high heat, bring butter, sugar and evaporated milk to a boil while stirring constantly to prevent scorching.

Step 3

Continue to stir constantly and boil for 5-10 minutes until until candy thermometer reaches 234° F. It will be boiling hard and violently. Remove from heat.

Step 4

Stir in vanilla extract, chocolate chips and marshmallow creme until well combined and melted. At this point you could also add in nuts if desired (like walnuts or pecans).

Step 5

Pour into prepared pan, using an offset spatula to spread out evenly.

Step 6

Cool completely at room temperature, about 3 hours.

Step 7

Lift fudge from pan and cut into 1-inch cubes.