Each time a student interrupts you or blurts out, hand them a card and keep talking. There are a number of ways to incorporate this into your existing classroom management system, or to use as a Tier 1 or Tier 2 intervention.
Birthday board I made for my kiddos. I downloaded the months off of Teachers Pay Teachers and used one of my fonts on Word to print out the word "birthday." The parents and kids love the new display for the classroom :)