Cook the Pasta: Boil a large pot of salted water, add penne pasta, and cook until al dente, about 10-12 minutes. Drain, reserving 1 cup of pasta water.

Sauté Aromatics: In a large skillet, heat olive oil over medium heat. Add diced onion and minced garlic, and sauté for about 5 minutes until fragrant.

Brown the Beef: Add lean ground beef to the skillet, cooking for about 7 minutes until browned. Season with salt, pepper, and Italian seasoning.

Create the Creamy Sauce: Reduce heat to medium-low, stir in heavy cream, and gradually add reserved pasta water to achieve desired consistency.

Combine and Serve: Mix in grated Parmesan cheese, add drained penne, and toss until coated with sauce. Serve garnished with extra cheese or parsley if desired.