Cook fettuccine according to package directions until al dente.

While fettuccine cooks, melt butter in a saucepan over low heat.

Add grated Parmesan cheese and heavy whipping cream to the melted butter.

Whisk the cheese and cream mixture together until smooth and well combined.

Drain the cooked fettuccine.

Immediately add the drained fettuccine to the cheese mixture in the saucepan.

Toss the fettuccine and sauce together until the pasta is evenly coated.

Serve immediately, garnished with additional shredded Parmesan cheese.