Brown the beef with onion

• Brown the ground beef with the diced white onion in a frying pan.
• Season with garlic powder, Italian seasoning and pepper to taste.

Simmer the meat sauce

• Add the marinara sauce and let it simmer.

Cook the spaghetti

• Cook the spaghetti in salted boiling water until al dente.
• Drain the pasta.

Make the Alfredo sauce

• Melt the butter with the minced garlic in a saucepan.
• Add the heavy whipping cream and season again.
• Once simmering, add the Parmesan cheese slowly while whisking.

Layer the baking dish

• Add the cooked, drained pasta to a baking dish.
• Top with the Alfredo sauce and mix it all up.
• Add the meat mixture on top without mixing it in, keeping it layered.
• Top with as much mozzarella cheese as you want.

Bake

• Bake at 350 °F (175 °C) until the cheese is melted and bubbly.