For the Casserole:
Preheat oven to 375°F.
Whisk together the heavy cream, Musselman's Apple Butter, eggs and cinnamon. Spray 9x11 casserole dish with non-stick. Place the bottom halves of the croissants in an even layer. Pour half of the apple butter/cream mixture over the croissants. Top with half of the caramelized apple mixture. Arrange the croissant tops in an even layer. Top with the remaining cream mixture and apples. Pour all of the syrupy apple mixture over the casserole. Gently press down on the top with a wooden spoon or spatula. Bake at 375° for 25 minutes. Once lightly browned on top; remove from oven, glaze and serve.