Step 1: Heat olive oil in a large skillet over medium heat. Add the chopped onion and sauté until soft and translucent.

Step 2: Add minced garlic and cook for about 30 seconds until fragrant, being careful not to burn it.

Step 3: Add the beef to the skillet. Cook, breaking it apart if using ground beef, until fully browned and cooked through.

Step 4: Season the beef with salt, black pepper, oregano, basil, and red chili flakes if using. Stir well to combine.

Step 5: Add the sliced zucchini to the skillet. Stir and cook for 5–7 minutes until the zucchini is tender but still slightly firm.

Step 6: Reduce heat to low and sprinkle grated Parmesan evenly over the skillet. Stir gently until the cheese melts and coats the ingredients.

Step 7: Remove from heat and garnish with fresh parsley or basil before serving.