Heat olive oil in large skillet. Add ground beef and sausage. Cook 8 minutes until browned. Break meat into small pieces. Drain excess fat. Rich flavor starts here.

Stir in onion, carrots, celery. Cook 7 minutes until soft sweet. Add garlic and tomato paste. Cook 2 minutes. Fragrant aroma fills kitchen beautifully.

Pour crushed tomatoes over meat mixture. Add oregano, salt, pepper. Bring to simmer. Cook uncovered 25 minutes. Sauce thickens perfectly. Taste deepens hourly.

Mix ricotta, eggs, Parmesan, 2 cups mozzarella, parsley, salt in bowl. Stir smooth creamy. Perfect consistency for spreading. Sets beautifully when baked.

Spread 1 cup meat sauce in 9x13 dish bottom. Prevents sticking perfectly. Creates flavor base for every bite. Essential first layer step.

Add 4 noodles over sauce. Spread 1/3 cheese mixture. Spoon 1/3 remaining meat sauce. Repeat layers twice. Noodles, cheese, sauce. Beautiful tower forms.

Sprinkle extra mozzarella generously on top. Cover tightly with foil. Bake 40 minutes at 180°C (350°F). Remove foil. Bake 20 minutes golden. Rest 15 minutes before cutting.