Maple Walnut Sweet Potato Casserole - Diamond Nuts

Ingredients

• 2 pounds sweet potatoes, peels, and sliced 1/4-inch thick
• 2 pounds yams, peeled, and sliced 1/4-inch thick
• 2 large ripe pears, peeled, cored and thinly sliced
• 1/4 cup brown sugar
• 1 teaspoon cinnamon
• 1/4 cup maple syrup
• 1/4 cup butter, cut into small pieces
• 1 cup coarsely broken or chopped Diamond of California® walnuts