In a skillet, brown the Italian sausage over medium heat, breaking it up with a spoon as it cooks. Drain off any excess grease.
1 pound Italian sausage
In your slow cooker, layer the cubed potatoes, chopped onion, and chopped red bell pepper.
5 medium potatoes, 1 large onion, 1 red bell pepper
Spread the browned sausage evenly over the vegetables. Sprinkle the minced garlic over the sausage.
1 pound Italian sausage, 2 cloves garlic
In a separate bowl, whisk together the condensed cream of mushroom soup and milk until smooth.
10.75 ounce condensed cream of mushroom soup, 1/2 cup milk
Pour the soup mixture over the ingredients in the slow cooker. Sprinkle with dried thyme, salt, and pepper.
10.75 ounce condensed cream of mushroom soup, 1/2 cup milk, 1 teaspoon dried thyme, 1/2 teaspoon salt, 1/4 teaspoon black pepper
Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours, or until the potatoes are tender.
During the last 30 minutes of cooking, sprinkle the shredded cheddar cheese over the casserole.
1 cup shredded cheddar cheese
Once the cheese is melted and bubbly, serve your delicious Slow Cooker Sausage Potato Casserole hot. Enjoy!