Crock Pot Scalloped Potatoes

Bahan-bahan (8 porsi)

• ½ large onion (thinly sliced)
• 1 tablespoon butter
• 1 ½ cups shredded cheddar cheese (divided)
• 10.5 ounces condensed cream of chicken soup (1 can)
• 1 ½ cups heavy whipping cream (divided)
• 1 teaspoon garlic powder
• ½ teaspoon dried thyme leaves
• ¾ teaspoon salt (or to taste)
• ½ teaspoon black pepper (to taste)
• 3 pounds Yukon gold potatoes ( or red skinned potatoes, thinly sliced)