Preheat oven to 350F. In a large skillet or Dutch oven, melt butter. Add peppers, onion, celery and garlic. Stir and cook 10 minutes. Add crawfish, half-and-half and cheese. Stir and cook on low until cheese melts. Prepare fettuccine according to package directions. Drain.
Combine fettuccine and cheese sauce. Pour in a 3-quart casserole. Cover and bake in a 350F for 30 minutes. Before serving, top with Parmesan cheese.
Cajun Country -- New Iberia, Louisiana