Easy Ham and Potato Casserole with Cheddar

Ingredients

• 4 medium-sized russet potatoes, peeled and thinly sliced
• 2 cups cooked ham, diced (preferably leftover ham)
• 1 cup shredded sharp cheddar cheese
• 1 medium onion, finely chopped
• 2 garlic cloves, minced
• 1 cup sour cream
• 1 cup milk
• 1 teaspoon dried thyme
• ½ teaspoon black pepper
• 1 teaspoon salt
• 1 tablespoon olive oil
• 1 cup breadcrumbs
• 2 tablespoons melted butter