Add the lean ground beef to the skillet. Break it up with a spatula and cook until browned and fully cooked, about 4-5 minutes.
Season the beef and vegetable mixture with salt, pepper, and Italian seasonings to taste. You can adjust the seasonings based on your preference.
Pour in the marinara sauce and stir to combine. Reduce the heat to low and let the sauce simmer for about 10-15 minutes, allowing the flavors to meld together.
While the sauce is simmering, cook the whole wheat spaghetti according to the package instructions. Drain and set aside.
Once the Bolognese sauce has simmered and thickened, it's ready to serve.