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This recipe was uploaded by clairebear87
Add the butter to a separate pan and melt over a low heat, add the flour and mustard powder and mix until you form a paste that leaves the pan clean. Gradually add the milk and whisk, gradually turning up the heat as you do so. Once you have formed a smooth source, remove from heat and mix in the cheese.
Now to build the lasagne! You will need rather a large lasagne dish. Add 1/3 of the baked bean mix and top with 2 or 3 lasagne sheets ( depending on size) Repeat this process another 2 times! Top with the white source and extra cheese if desired.
Bake in a hot oven 180c/fan 160c/gas for around 40 minutes until golden.