Beef Garlic Butter Pasta (One Pot, 32 Minutes)

Ingredients

• 1 tablespoon olive oil
• 1 lb (450 g) 85 percent lean ground beef
• 1 teaspoon kosher salt, divided
• 1/2 teaspoon black pepper
• 3 tablespoons (42 g) unsalted butter, divided
• 1 small yellow onion, finely chopped
• 6 garlic cloves, minced
• 1 teaspoon Italian seasoning
• 1/4 teaspoon crushed red pepper flakes, optional
• 3 cups (720 ml) low-sodium beef broth, plus more as needed
• 1 cup (240 ml) whole milk
• 1/2 cup (120 ml) heavy cream
• 12 oz (340 g) cavatappi, rotini, or penne pasta
• 1/2 cup (50 g) finely grated parmesan cheese, plus more for serving
• 2 tablespoons chopped fresh parsley