In a large saucepan, bring the chicken broth to a boil over medium-high heat. Add the pastina and cook according to package directions, usually 4-6 minutes, until al dente.
Reserve 1 cup of the cooking liquid, then drain the pastina. Return the drained pastina to the pot and remove from heat.
Add the butter to the warm pastina and stir gently until melted and creamy. If needed, add a splash of the reserved cooking liquid to create a silky consistency.
Stir in 1/2 cup of the Parmesan cheese, garlic powder, salt, and pepper. Add more cooking liquid as needed to reach your desired consistency.
Taste and adjust seasoning as needed. Serve immediately in bowls, topped with remaining Parmesan cheese, fresh parsley, and additional black pepper.
Notes
Storage tip: Keeps in fridge for up to 4 days. Reheat gently with a splash of broth or milk. For a richer version, stir in a beaten egg off heat for carbonara-style pastina.