Add olive oil to a large pot or dutch oven and place over medium high heat. Add in diced onion, celery, sliced carrots and potatoes. Saute for 3-5 minutes or until onions soften.
Next add in crushed tomatoes, kidney beans, vegetable broth, Italian seasoning, red pepper flakes and salt and pepper. Cover and cook on medium low for 10-15 minutes.
Next stir in the green beans, spinach and pasta. Cook uncovered for 8-12 more minutes or until pasta is al dente and green beans are tender. Pour into a bowl and serve with parmesan cheese on top. I also like to serve mine with garlic bread, crostinis or crackers. Personally I think soup makes amazing leftovers and is even more delicious the next day.
