In a large slow cooker, combine onion, bell pepper, garlic, chicken broth, tomato paste, oregano and fire-roasted tomatoes, stirring until ingredients are evenly dispersed. Add chicken and stir.
Heat slow cooker on low for 6 to 8 hours, or on high for 3 to 4 hours. Slice thickest part of a piece of chicken to check for doneness (it should be fully opaque).
Switch setting to warm. In a saucepan, boil water and prepare pasta according to instructions for al dente noodles. Drain and ladle a few scoops into each bowl for serving.
Top noodles with chicken and vegetable soup. Add a scoop of cottage cheese or ricotta, then sprinkle basil and parm on top. Finish with a dusting of cracked black pepper.