In a large pot, heat the oil over medium-high heat. Add the onion and garlic and saute until the onion is translucent, about 3 minutes. Reduce the heat to medium and stir in the carrot, celery and bell pepper. Cook, covered, for 8-10 minutes, until the carrots have softened a little. Add the diced tomatoes, beans, vegetable broth cubes, water and Italian seasoning. Stir until well combined, then bring to a boil, stirring occasionally. Stir in the egg noodles then cook, covered, until the noodles are al dente, roughly 6-8 minutes. Serve!