To a medium skillet over medium heat, add ground beef, salt, and pepper. Cook, stirring occasionally and breaking up the meat as you go, for about 8-10 minutes, or until it is no longer pink. Add garlic and cook for 1 more minute. Drain excess grease if necessary.
To the bowl of a slow cooker, add the cooked ground beef, green pepper, red pepper, onion, frozen hash browns, cheddar cheese soup, sour cream, and Worcestershire sauce. Stir to combine.
Cover and cook on high for 2 ½ hours, or low for 4-5 hours.
Top with shredded cheese. Cover and cook for 10 more minutes, or until the cheese is melted.
Garnish with parsley. Salt and pepper, to taste.