Unusual, delicious fudge, requiring a minimum of beating. Combine brown sugar, sugar, cream substitute, and butter in a large saucepan. Cook to 110ºC .. Remove from heat, let bubbles subside. Add marshmallow cream, semisweet chocolate and butterscotch coating. Stir until well blended. Stir in nuts and vanilla. Pat into a buttered 23 cm square pan. Cut into squares when cool. Makes about 64 pieces.