Preheat oven 375 degrees F
Cook gluten free pasta according to package directions. Drain and set aside.
In a medium saucepan, melt non-dairy butter substitute and onion. Cook onion until translucent.
Using a whisk, stir in flour, salt and pepper
Add rice milk; cook until thickened and bubbly.
Add in cheese substitute and stir until melted
Add cooked pasta to cheese mix
To oven bake, transfer to a 1 quart casserole dish. Bake uncovered for 20 - 25 minutes until bubbly.