Boil the Pasta: Bring a large pot of salted water to a boil over high heat. Add the rigatoni pasta and cook for 10-12 minutes until al dente. Drain and set aside.

Sear the Steak: In a skillet, heat olive oil over medium-high heat. Add steak pieces and sear for 3-4 minutes until browned. Remove and keep warm.

Sauté the Vegetables: In the same skillet, add onion and bell pepper. Sauté for 5 minutes until softened. Add minced garlic and cook for an additional minute.

Make the Creamy Sauce: Lower heat and pour in heavy cream, stirring to deglaze the pan. Mix in crumbled blue cheese, oregano, salt, and pepper. Cook for 3-4 minutes until thickened.

Combine Steak and Pasta: Return steak to the skillet with sauce, followed by rigatoni. Toss together for 1-2 minutes until fully coated.

Transfer to Baking Dish: Preheat oven to 375°F (190°C) and layer the mixture into a greased baking dish. Top with mozzarella cheese.

Bake to Perfection: Bake for 15-20 minutes until cheese is melted and golden. Keep an eye on it as it bakes.

Garnish and Serve: Let cool for a few minutes and garnish with parsley before serving.