Carrot, Parsnip and Potato Gratin

Ingredients

• 1 pound medium carrots, thinly sliced
• 1/2 pound medium parsnips, peeled and thinly sliced
• 1/2 pound Yukon Gold potatoes, peeled and thinly sliced
• 1 small onion, halved and sliced
• 2 garlic cloves, minced
• 1-1/2 teaspoons minced fresh rosemary
• 1/2 teaspoon salt
• 1/2 teaspoon ground nutmeg
• 1 cup half-and-half cream
• 1/4 cup heavy whipping cream