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Prepare oven and pan: Preheat oven to 350°F. Coat a 9- x 13-inch baking dish with cooking spray; set aside.
Cook the spaghetti: Bring a large pot of salted water to a boil over high. Add spaghetti, and cook according to package directions. Drain pasta, and return to pot.
Make the meat sauce: While pasta cooks, heat a large nonstick skillet over medium-high. Add ground sirloin and sausage. Cook, breaking up meat into smaller pieces with a wooden spoon and stirring occasionally, until meat is browned and no longer pink, about 6 minutes.
Add onion and garlic: Add onion and garlic to meat mixture; cook, stirring occasionally, until onion is translucent, about 4 minutes.
Add marinara: Stir 3 ½ cups of the marinara into meat mixture. Remove from heat.
Add butter and marinara to pasta: Add butter and remaining ½ cup marinara to pasta in pot. Toss until butter is melted. Transfer mixture to prepared baking dish.
Make cheese mixture: Stir together cream cheese, ricotta, and Parmesan in a small bowl until smooth. Spread evenly over pasta mixture in baking dish.
Add meat sauce: Top pasta mixture with meat sauce. Sprinkle evenly with mozzarella.
Bake the spaghetti: Bake in preheated oven until sauce is bubbling and cheese is golden, about 30 minutes. Let stand 10 minutes. Garnish with parsley, and serve.