Preheat your oven to 400 degrees F and line a baking sheet with parchment paper for easy cleanup.

In a large bowl, combine the ground Italian sausage, egg, breadcrumbs, grated Parmesan cheese, minced garlic, and chopped parsley. Mix until just combined, being careful not to overwork the mixture to keep the meatballs tender.

Form the mixture into 1-inch balls and arrange them on the prepared baking sheet, spaced evenly apart.

Bake in the preheated oven for 20 minutes, or until the meatballs are browned and cooked through.

Serve the meatballs hot with your favorite pasta sauce, on a sandwich, or enjoy them on their own as a tasty appetizer.