Blend Bisquick, milk and egg until there are no lumps. In a separate bowl evenly blend the sugar and cinnamon. Spray the bottom portion of your slow cooker generously with non-stick spray. Set on high. Pour your mixture into the bottom of the slow cooker.
Then, sprinkle the cinnamon and sugar mixture evenly over the top of the batter. Take the end of a spoon and swirl the cinnamon and sugar down into the batter. Cook for approximately 1 hour to 1 hour and 15 minutes. Check the center to with a fork, when none of the batter sticks, your breakfast is ready.