Healthy Sweet Potato Casserole

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2 pounds sweet potatoes, peeled and cut into 2-inch pieces

3 medium carrots, 8 ounces, peeled and cut into 2-inch pieces

1/4 cup packed light brown sugar

2 tablespoons unsalted butter

2 teaspoons freshly grated ginger

1/2 teaspoon finely grated orange zest

1/2 teaspoon ground cinnamon

Kosher salt and freshly ground black pepper

2 egg whites, lightly beaten

1/3 cup chopped pecans