Easy Cocktail Meatballs

Name: Easy Cocktail Meatballs
Ingredients: Cooking spray; 1/2 medium yellow onion; 2 cloves garlic; 1 large egg; 1 pound ground chuck (80% lean); 1/2 cup plain breadcrumbs; 2 1/2 teaspoons Worcestershire sauce; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; Pinch ground nutmeg; 1 (14-ounce) can jellied (smooth) cranberry sauce; 1 (12-ounce) bottle chili sauce, preferably Heinz; 2 tablespoons packed brown sugar; 1 tablespoon Dijon mustard; 1 1/2 teaspoons freshly squeezed lemon juice; 1/2 teaspoon kosher salt; 8 sprigs fresh parsley