Set Global Sun Oven out to preheat.
Spray an 11x7x2-inch baking dish or an oval lidded roasting pan with cooking spray.
Heat 1 tablespoon of oil in a heavy large skillet over medium heat. Add onions, sprinkle with kosher salt, and sauté until soft and beginning to brown, stirring frequently, about 10 minutes. Remove from heat and stir in parsley.
Using your hands or a fork, break the salmon into small pieces and smash bones. Arrange 1/3 of the potatoes, overlapping them, in prepared baking dish. Sprinkle with kosher salt and pepper. Scatter half of the onion mixture and half of the salmon over the potatoes. Sprinkle with 2 tablespoons pecorino Romano and 1 tablespoon capers. Repeat layering with half of the remaining potatoes, salt, pepper, remaining onions, salmon, capers, and 2 tablespoons pecorino Romano. Cover with remaining potato slices. Sprinkle with salt and pepper. Pour broth over. Press down firmly on potatoes to compact casserole. Drizzle with remaining 1 tablespoon of oil.
Cover with aluminum foil and a tea towel, or lid. Bake in Sun Oven until potatoes are tender, about 1 hour 30 minutes. About 10 minutes before removing from Sun Oven uncover and sprinkle with remaining 4 tablespoons pecorino Romano. Let stand 10 minutes before serving.
This Solar Salmon and Potato Casserole recipe is from the Sun Oven Cooking Cookbook. Download this Cookbook today.
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