Provided by tomsmith2465
Number Of Ingredients 11
Steps:
- 1. Preheat the oven to 400 degrees 2. Saute the onion in the butter until translucent 3. Stir in the flour and cook for 2 mins 4. Slowly stir in the milk 5. Stir in the cheeses, salt, pepper and mustard 6. Continue to cook over medium heat, stirring constantly, until thickened. 7. Stir in the prepared macaroni. 8. Lightly butter a casserole dish and pour the pasta mixture into the dish 9. Bake for 20 mins
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