Provencal Summer Squash and Potato Gratin

Preheat the oven to 375 degrees F. Lightly mist a shallow 2-quart baking or gratin dish with cooking spray. Thinly slice the squash, zucchini, potato, and onion 1/4-inch thick with a mandolin or by hand. Shingle the vegetables in the prepared baking dish in one layer. Season with salt and pepper. Sprinkle with the rosemary leaves and drizzle with olive oil. Cover with foil and bake until the potatoes are tender, 30 to 35 minutes. Remove the foil; sprinkle with the cheese. Bake until the cheese is browned and most of the liquid has evaporated, about 45 minutes more. Let stand at least 10 minutes. Serve warm or at room temperature. Nutritional analysis per serving Calories 87; Total Fat 5.2g (Sat Fat 2.2g, Mono Fat 1.7g, Poly Fat 0.3g) ; Protein 3g; Carb 8g; Fiber 1.5g; Cholesterol 5mg; Sodium 163mg