In a medium saucepan, heat cream and butter over medium heat, stirring frequently, just until bubbles form around edges of pan. (Do not boil.) Remove from heat; pour hot cream mixture over chocolate. Let stand for 5 minutes; stir until chocolate is melted and mixture is smooth. Use immediately.
Notes
We used Guittard Extra Dark Chocolate Chips.
Recipe by Bake from Scratch at https://bakefromscratch.com/dark-chocolate-crunch-bars/