Set the oven to 375 degrees Fahrenheit. Allow it to fully heat before baking the casserole evenly and properly later.

Boil elbow macaroni according to package instructions. Drain well and set aside while preparing the flavorful meat sauce mixture.

Heat olive oil inside a large skillet. Add onions and cook until soft and lightly golden for deeper flavor.

Stir chopped bell peppers into the skillet. Cook several minutes until slightly tender and fragrant while stirring occasionally throughout.

Mix minced garlic into the vegetables carefully. Cook for one minute until fragrant but avoid burning the garlic pieces.

Add ground beef into the skillet. Cook until browned completely while breaking the meat into smaller crumbles using spoon.

Stir tomato sauce, diced tomatoes and tomato paste into the beef mixture. Mix carefully until fully combined and smooth.

Sprinkle Italian seasoning, salt and black pepper into the sauce. Simmer gently for ten minutes to deepen the flavors.

Add cooked macaroni into the skillet carefully. Stir until every pasta piece becomes coated with rich savory sauce evenly.

Transfer half the pasta mixture into a baking dish. Sprinkle cheese, then repeat layers with remaining pasta and cheese.

Place casserole inside the oven. Bake for twenty minutes until bubbly, melted and golden brown on top beautifully.

Sprinkle fresh parsley over the casserole before serving. Enjoy warm for the best cheesy and comforting flavor experience.