Scaling a Sprite

Hello! This is how I created my cow sprite. I want to scale it up by two, but not sure how to accomplish that. I tried scale.setTo(2,2), but that broke my code.

   cow_enemy_ = this.physics.add.group( 
                {
                    key: 'cow',
                    immovable: true,
                    allowGravity: false 
                    }
          ); 

Phaser.Actions.RandomRectangle(cow_enemy_.getChildren(), dust_spawn_area);

Phaser.GameObjects.Sprite#setScale