- Bring a large pan of lightly salted water to the boil, add the pasta and cook for 10-12 minutes - until just tender (or follow pack instructions). Drain well.
- Meanwhile, melt the spread in a pan and stir in the flour, cook for 1 minute stirring, then add the milk, whisking as you do so. Cook stirring until you have a smooth thickened sauce. Beat in the mustard and half of the cheese.
- Pour the sauce over the drained pasta and mix well. Spoon into a large heatproof serving dish (or individual dishes) and sprinkle remaining cheese over the top.
- Grill under a medium heat for 2-3 minutes until cheese melts and is bubbling