In a medium saucepan, bring the 3 cups low sodium chicken broth or vegetable broth to a low boil.
Stir in the 1 1/2 cups pastina pasta and simmer for an additional 2 minutes before removing from the heat. Stir after adding to prevent clumps.
Immediately add the 4 tablespoons unsalted butter and 1 cup parmesan cheese, stirring until combined. Add the 1/4 teaspoon coarse kosher salt and freshly ground black pepper to taste, if desired.
Serve while hot.
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