Autumn Potato and Leek Gratin Recipe

• 1-1/2 pounds Yukon Gold potatoes, cut into 1/4-inch
• thick slices
• 1-1/2 pounds sweet potatoes, cut into 1/4-inch
• thick slices
• 2 cups thinly sliced leeks, (about 2)
• 4 cups cream">whipping cream or heavy cream
• 1-1/2 teaspoon salt
• 3/4 teaspoon black pepper
• 2 cloves garlic, minced
• 2 thyme sprigs
• 1 bay leaf
• 1-1/2 cups shredded Gruyere cheese,(divided)

Directions