Step 1: Prepare the Pasta: Cook the pasta according to package directions until al dente. Drain well and set aside. This prevents the bake from becoming overly soggy.
Step 2: Saut the Chicken and Vegetables: Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook until browned on all sides and cooked through. Add the onion and garlic, and cook until softened, about 3 minutes. Stir in the bell peppers and broccoli florets, and cook for another 5 minutes, until slightly tender. Ensure all vegetables are evenly cooked for optimal flavor and texture.
Step 3: Combine the Sauce: Stir in the marinara sauce, heavy cream, chicken broth, oregano, salt, and pepper. Bring to a simmer and cook for 5 minutes, stirring occasionally. Simmering allows the flavors to meld, creating a rich and cohesive sauce.
Step 4: Assemble the Bake: In a large bowl, combine the cooked pasta, chicken and vegetable mixture, and 1 1/2 cups of the mozzarella cheese. Mix well to ensure the pasta is evenly coated with the sauce and cheese.
Step 5: Transfer to Baking Dish: Pour the pasta mixture into a greased 9x13 inch baking dish. Spreading the mixture evenly ensures consistent cooking and browning.
Step 6: Top with Cheese: Sprinkle the remaining 1/2 cup mozzarella cheese and the Parmesan cheese evenly over the top of the pasta bake. This creates a delicious, golden-brown crust.
Step 7: Bake: Bake in a preheated oven at 375F (190C) for 20-25 minutes, or until the cheese is melted and bubbly, and the bake is heated through. Baking until bubbly indicates the bake is heated through and the cheese is properly melted.
Step 8: Rest and Serve: Let the pasta bake rest for 5-10 minutes before serving. Garnish with fresh basil leaves, if desired. Resting allows the bake to set slightly, making it easier to serve.
Optional: For a spicier kick, add a pinch of red pepper flakes to the sauce. You can also substitute the broccoli for other vegetables like zucchini or mushrooms.