1. In a large nonstick skillet, cook the bacon in the oil until crisp.
2. Bring a large pot of salted water to a boil, add the fettuccine, and cook until tender, but firm.
3. In a blender, combine the milk, cheese, puree, and salt. Mix well.
4. Drain the pasta, and add it to the skillet with the bacon. Pour the sauce onto the pasta, and toss well. Add the peas, and toss one more time. Sprinkle with the parsley (if using) and serve immediately.