Add rice, chicken broth, tomato paste, and seasonings to a small saucepan. Cover with lid and bring to a simmer. Simmer on low until liquid has been absorbed and rice is tender.
While rice cooks sear the kielbasa in a large nonstick skillet set over medium heat. Periodically flip the sausage to ensure it cooks evenly. Once seared and heated through, remove from skillet and set aside.
Add peppers and onions to the skillet and saute them in the leftover rendered fat from the kielbasa.*
Once peppers and onions are tender, add kielbasa back to the skillet along with the cooked rice. Mix together, taste for salt, and adjust as needed. Serve immediately.
*If there isn't enough rendered fat, add a tablespoon of butter or cooking oil as needed.