In large pot, boil liver pieces with garlic cloves until liver is just tender. (About 30 - 40 mins)
Remove from pot and let drain.
Place on cookie or pizza sheet and sprinkle lightly with garlic powder.
Preheat oven to lowest setting ( 250), place sheet with liver in for about 15 minutes or until the edges start to dry. Turn over and repeat. (Second side will take only 5-8 mins)
Once cooled, you can separate and freeze in zip lock bags until ready to take to the show or class.