Maybe not lightning fast, but really quick!
1 can condensed milk
1/2 c peanut butter
12 ounces (400g) white chocolate bits
3/4 c chopped nuts
1 t vanilla
Heat milk and peanut butter in saucepan until bubbly.Remove from heat and stir in white chocolate bits. Stir until smooth. Add nuts and vanilla.
Spread into waxed/cooking paper lined 8-inch pan. Cool. Cover and chill for 2 hours, until firm. Turn fudge onto cutting board, peel off paper. Sprinkle with additional nuts, if desired. Cut into squares. Store leftovers in fridge.
stolen taken from Eaglebrand.com