Add the ground beef, onion, garlic, bell pepper, and carrot to a skillet over medium heat and cook for 5 minutes while stirring occasionally.
Turn off the heat and add the Italian seasoning and stir.
Add the jar of spaghetti sauce and toss together.
Cook the spaghetti noodles according to package directions in a pot of water, then drain.
Add the drained noodles back to the pot and immediately add the cream cheese and stir until it is melted.
Add some of the meat sauce to the bottom of a 9x13-inch baking dish.
Add the noodles on top of the meat sauce.
Add the rest of the meat sauce to the top of the noodles.
Add the Parmesan cheese.
Add the mozzarella cheese, then bake in the oven at 350º F for 30 minutes.