Step 1: Bring a large pot of salted water to a boil and cook bowtie pasta according to package directions until al dente. Drain and set aside.
Step 2: While pasta cooks, heat olive oil in a large skillet over medium-high heat. Add ground beef and cook until browned, breaking it up with a spoon (about 5-7 minutes).
Step 3: Add diced onion to the skillet and cook until softened (about 3-4 minutes). Stir in minced garlic and cook for 30 seconds until fragrant.
Step 4: Reduce heat to medium. Pour in beef broth and heavy cream, then add oregano, salt, and pepper. Stir well and simmer for 5 minutes until slightly thickened.
Step 5: Stir in cooked bowtie pasta and Parmesan cheese until well combined and heated through (about 2 minutes).
Step 6: Garnish with fresh parsley if desired and serve immediately.