In a large pot or Dutch oven, add the sliced smoked sausage over medium heat. Cook until the sausage is browned, about 3-5 minutes.
Add the diced onion and minced garlic to the pot, sauté for another 2-3 minutes until the onion is translucent and fragrant.
Stir in the diced tomatoes, chicken broth, Italian seasoning, paprika, salt, and pepper. Bring the mixture to a boil.
Once boiling, add the penne pasta to the pot. Reduce the heat to a simmer, cover, and cook for about 10-12 minutes, or until the pasta is al dente, stirring occasionally.
After the pasta is cooked, stir in the frozen peas and cook for an additional 2 minutes until the peas are heated through.
Remove the pot from heat and fold in the shredded mozzarella cheese until melted and creamy.
Serve hot, garnished with fresh parsley.