Preheat oven to 350°. In a large microwave safe bowl, melt butter. Remove from microwave and mix in brown sugar. Once combined mix in milk, eggs, vanilla extract, and salt. Cube cinnamon raisin bread into small pieces. Add to bowl. Peel and cube apples. Add to bowl. Mix everything until well combined. Grease an 8x8 cooking pan or bowl. Place in oven and cook for 60-70 minutes or until bread mixture has 'puffed' up and is golden brown on the top. Remove from oven. Let cool for 15 minutes, then while still warm, drizzle cream cheese icing over the top. To get icing 'liquidy' put in a microwave safe bowl for 20-30 seconds, stir, and drizzle! Serve immediately and enjoy!