Preheat the oven to 180 oC
Place the pasta in a pan of salted boiling water and cook per the instructions on the packet
Melt the butter in a medium sized saucepan over a medium heat
Stir in the flour and onion powder until it forms a smooth paste
Gradually pour in the milk and stir continually until the sauce comes to the boil
Simmer until the sauce thickens, about 2 minutes
Stir in 2/3 of the cheese
Season with salt and pepper
Stir through the pasta
Pour in a casserole dish and top with the remaining cheese
Bake in the oven until golden and bubbling, about 10-15 minutes
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