01 -
Preheat oven to 350°F (175°C). Spray a 9×13-inch baking dish with non-stick spray and set aside.
02 -
In a large skillet over medium-high heat, brown and crumble the ground beef. Season with garlic powder, seasoned salt, and pepper. When beef is halfway cooked, add the diced onion and bell peppers. Continue cooking until vegetables are slightly softened and beef is fully cooked. Remove from heat.
03 -
Meanwhile, cook pasta according to package directions until al dente (slightly underdone). Drain thoroughly.
04 -
In a medium saucepan over medium heat, melt together the butter, cream cheese, and heavy whipping cream, stirring constantly. Add garlic powder and Parmesan cheese, stirring until fully combined. Bring mixture to a slight boil, then immediately reduce heat to low. Continue stirring until sauce thickens, about 2 minutes. Remove from heat and season with black pepper.
05 -
Spread cooked pasta evenly in the prepared baking dish. Top with the beef-vegetable mixture and toss gently to combine. Pour the Alfredo sauce over everything, then sprinkle evenly with shredded cheese.
06 -
Cover the baking dish with foil and bake for 25 minutes or until hot throughout and cheese is completely melted. Serve warm.