Spray the slow cooker generously with cooking spray.
Add half of the hash browns to the bottom of the slow cooker and top with half of the onions, bell pepper, cooked meat, and cheese. Repeat again with the remaining half.
My casserole was done after 6.5 hours on LOW.
Spray heavily when greasing your pot. You can also line your slow cooker with parchment paper or use a liner.