Toss the chicken pieces with the italian seasoning, paprika, salt, pepper, + red pepper. set aside while you prep/chop the rest of the ingredients.
Note: you can certainly skip the next step of searing the chicken + partially cooking the vegetables, to save time. it *will* add lots of additional flavor to the dish, so if you have the extra time, it’s worth it!
Heat 1 tablespoon olive oil in a skillet over medium heat. add the seasoned chicken, + cook until chicken has seared slightly on all sides. transfer chicken to the slow-cooker.
In the same pan, add 1 more tablespoon of olive oil. add the peppers, onion, + garlic to the pan + cook for about 5 minutes, until the vegetables have softened slightly. transfer the mixture to the slow-cooker.
Add the pasta sauce + bay leaf to the slow-cooker. (note: if you skipped the previous step of pre-searing/cooking the chicken + veggies, add the chicken, onions, peppers, garlic to the slow-cooker at this point, too) stir everything to combine.
Cover, + cook on low for 4-5 hours, until chicken is fall-apart tender.
When ready to serve, toss the prepared pasta with a bit of the cacciatore sauce first, then top with the chicken, peppers + onion mixture. top with freshly-chopped parsley + parmesan cheese, if desired.