Cook pasta al dente according to package instructions. Drain and set aside.
Melt butter in a skillet over medium heat. Add garlic and sauté for 1 minute until fragrant.
Add beef to the skillet. Cook until browned, breaking it apart with a spoon.
Stir in cooked pasta, parmesan, and parsley. Toss to coat evenly.
Season with salt and pepper. Serve immediately with extra parmesan.
Notes
Variations: Add red pepper flakes for heat, use zucchini noodles for low-carb, or stir in heavy cream for a creamy sauce. Storage: Refrigerate in an airtight container for up to 3 days. Reheat gently with a splash of water.