Prepare an 8-inch square baking dish by lining it with parchment paper. Set aside.
Add white chocolate morsels, vanilla bean paste, and marshmallow cream to a large mixing bowl. Set aside.
In a large, heavy saucepan, add butter, cream, sugar and salt. Bring to a boil over medium high heat, stirring frequently. Once boiling, continue to boil for a full 5 minutes, stirring constantly. Remove from heat and pour over white chocolate mixture. Using an electric mixer, blend for about one minute, until morsels are melted and mixture is smooth.
Pour in chopped toffee candy, stir ONCE.
Pour mixture into prepared baking dish and allow to set for two hours (or overnight), covered with a piece of plastic wrap.
Once set, cut into bite sized pieces and store in an airtight container at room temperature for two weeks. For freshest fudge, only cut as needed, keeping the large chunk of fudge in a ziploc bag until ready to eat.
Notes
Use an electric mixer for quick and easy mixing! A stand mixer with the whisk attachment is perfect.
Store the fudge uncut until ready to serve. This helps it stay fresh and smooth longer!
Do not over stir after adding the toffee. One stir is enough to incorporate the toffee bars without disrupting the fudge mixture as it cools.