Original recipe, here (randomly). It sounds like it is from The Good Housekeeping Step-by-Step Cookbook.
Ingredients:
- 2 tsp extra virgin olive oil
- 1 small onion, diced
- 1 garlic clove, minced
- 2 cups skim milk (I used whole because we had some and I figured it would be closer to cream)
- 1 cup chicken or vegetable broth
- 3 tbsp all-purpose flour
- 1/2 tsp salt
- 1/4 tsp coarsely ground black pepper
- 1/2 cup freshly grated Parmesan
- Heat oil in a 12-inch skillet on med-high heat, add onion and garlic and cook until golden.
- In medium bowl, whisk together the milk, broth, flour, salt, and pepper until well-blended. Stir the mixture into the skillet, turn heat to high, and cook until the mixture boils and thickens.
- Stir in the Parmesan cheese.
This is enough sauce to coat a one lb. box of fettuccine when it has been cooked.