1. In a large bowl mix beef through pepper. Form into 2? balls. Press a cheese cube in the middle and seal the meat around it.
2. Heat 1/2? olive oil in a large skillet. Brown meatballs and then set aside on plate.
3. Pour marinara sauce into pan; bring to a simmer.
4. Add meatballs and simmer until cooked through, about 30 minutes.
5. Serve over spaghetti or on top of a hoagie.