From NY Times:
4 tbsp butter, plus more for greasing the pan
1 lb chocolate, combination of semisweet and bittersweet
14-oz can sweetened condensed milk
1/8 tsp salt
1/2 cup chopped nuts (optional)
Melt butter and chocolate together. Add condensed milk and salt and stir until combined. Heat as little as possible. Add nuts if desired.
Scrape into a prepared 8×8-inch pan, coated with butter and lined with parchment paper.
Chill for about 4 hours. Lift fudge out of pan and cut into squares.
NOTE: 2024 Add vanilla? Other flavorings? Mint? This is a very easy and basic recipe.
From Ghirardelli:
4 oz. 100% baking bar
1 1/2 cups semi-sweet chocolate chips
14-oz can sweetened condensed milk
1 1/2 tsp vanilla extract
Prepare as above.