I wouldn't call this recipe low-fat due to the amount of cheese but it certainly is lower-fat than a traditional alfredo sauce.
1 lb pasta (I like to use any long flat noodle like fettuccine or pappardelle)
1 1/2 cups skim milk
1 Tbsp butter
1 Tbsp flour
3/4 cups grated parmesan cheese
1/2 tsp kosher salt
Optional: sauteed spinach or steamed broccoli
Cook pasta according to directions. Meanwhile in a large saucepan melt butter and whisk in flour creating a paste. Slowly whisk in milk so that the liquid gets absorbed and the mixture stays thick. simmer over low heat about 1-2 min. Stir in parmesan cheese and salt. If you sauteed spinach or steamed broccoli, add in now. Add pasta and coat with the sauce and serve. YUMM!
I made this the other night with spinach which I sauteed with a little olive oil, garlic and salt. I also used fresh pasta from Uncle Giuseppe's.