Cook fettuccine following package directions until al dente.
Melt butter in a large skillet over medium heat.
Whisk in flour and cook for 30-60 seconds.
Gradually add milk, whisking between additions.
Add cream cheese chunks and stir until melted.
Mix in Parmesan, parsley, and seasonings.
Gently stir in the crabmeat.
Cook on low until the crab is heated through.
Toss with pasta or serve sauce over pasta.
