Heat oven to 375°F. Spray cookie sheet with nonstick cooking spray. Unroll dough; separate into breadsticks. Cut each in half crosswise to make 24 small breadsticks. Press each breadstick until 1 1/2 inches wide.
With thumb, make indentation in center of each breadstick. Place 1 rounded teaspoon cheese in each indentation; top each with 1 teaspoon tomatoes. Roll up each jelly-roll fashion; place seam side down on sprayed cookie sheet.
In small bowl, combine egg and water; beat well. Lightly brush over tops of filled breadsticks. Sprinkle each with salt.
Bake at 375°F. for 12 to 17 minutes or until tops are light golden brown. Serve warm.