Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.

Meanwhile, melt butter in a large skillet over medium heat; cook eggs sunny-side up, or until whites are just about set and yolks still quite runny and not broken. Sprinkle garlic powder, ground black pepper, onion, and rosemary on eggs while cooking.

Place hot pasta in a deep plate or pasta bowl; top with fried eggs and stir together to allow eggs to continue cooking and broken yolks to create a sauce. Serve immediately, with grated Parmesan if you like.