Preheat oven to 375° F. Drain and press spinach to remove excess liquid. Combine all ingredients in a large mixing bowl; stir well. Form into 1-inch balls. Place on ungreased baking sheet; bake 18 to 20 minutes or until golden brown. Remove from oven; allow to cool 5 minutes before removing from pan. Serve with cocktail forks or toothpicks. Note: Italian Sausage Cheese Balls may be prepared ahead and frozen uncooked. To bake from frozen, thaw on baking sheet 15 minutes; bake in preheated oven 20 to 25 minutes or until golden brown. Variation: For firmer texture, add 3 cups baking mix and 2 cups shredded mozzarella to the ingredients listed above.