Ham & Potato Au Gratin | Mama's Cooking

Ingredients

• 2 tablespoons butter
• 1/2 white onion, diced
• 5 cloves garlic, minced
• 1/3 cup all-purpose flour
• 1 1/2 cups half-and-half
• 1 cup 2% milk
• 1 cup chicken broth
• 2 whole sprigs thyme, plus more, to taste, leaves pulled off, for garnish
• 1 teaspoon salt, plus more, to taste
• 1 cup cheddar cheese
• 1 1/2 cups mozzarella cheese, divided
• ground black pepper, to taste
• 1 pound russet potatoes, scrubbed and sliced 1/8-inch-thick
• 3 cups ham, cooked and sliced