To prepare meatballs, combine first 7 ingredients in a bowl; shape mixture into 32 (1-inch) meatballs. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add half of meatballs to pan; cook 8 minutes or until done, browning on all sides. Remove from pan; drain well on paper towels. Repeat procedure with remaining meatballs. Cover and chill.
To prepare dip, combine sour cream and remaining ingredients, stirring with a whisk. Cover and chill. Serve meatballs with dip.