Preheat oven to 425°.
Heat oil in a large skillet over medium-high heat. Add mushrooms, shallots, 1/4 teaspoon salt, and 1/4 teaspoon pepper; sauté 5 minutes or until moisture evaporates, stirring frequently. Remove from heat; stir in 1 tablespoon parsley and 1 tablespoon chives.
Arrange half of potato slices in a single layer in an 11 x 7-inch baking dish coated with cooking spray; sprinkle with 1/8 teaspoon salt and 1/8 teaspoon pepper. Spoon half of the mushroom mixture over potato slices; sprinkle with half of cheese. Repeat layers, ending with cheese; add broth to dish. Cover and bake at 425° for 30 minutes. Uncover and bake 20 minutes or until potatoes are tender. Sprinkle with remaining parsley and chives.