Yukon Gold and Sweet Potato Gratin | Savory

Ingredients

• 2 cups fat-free half & half
• 2 tbsp butter
• 1 tbsp dried sage
• 1 tbsp fresh rosemary
• 1 tbsp minced garlic
• 1/4 tsp salt
• 1 1/2 lbs Yukon Gold potatoes
• 1 1/2 lbs sweet potatoes
• Cooking spray
• 1 1/2 cups shredded Gruyère cheese