McDonald’s fans are crying out ‘this is a dream come true’ after the food chain confirmed its iconic Biscoff Mcflurry is making a triumphant return as part of a new spring menu – but there’s a catchMcDonald’s fans are crying out ‘this is a dream come true’ after the food chain confirmed its iconic Biscoff Mcflurry is making a triumphant return as part of a new spring menu – but there’s a catch