Meanwhile, heat olive oil in a large skillet over medium-high heat. Add ground beef and cook, stirring, until no longer pink, about 4 minutes. Add the red peppers, green onions, and a pinch of salt. Cook until crisp-tender, about 3 minutes. Move the beef mixture to one half of the pan, add the tomato paste to the other side, and toast for a minute. Sprinkle with the Italian seasoning and a pinch of salt. Add the diced tomatoes. Stir and bring to a simmer. Cook until slightly thickened, about 2 minutes.