Preheat oven to 375°F. Line a baking sheet with parchment. Place squash on baking sheet and toss with 2 tablespoons evoo, salt and pepper on one side of pan. Roast turning occasionally. While squash is roasting, prepare fish. Set out 1 bowl with egg white mixture and 1 bowl or plate with puffed rice, onion powder and garlic powder. Season fish with salt and pepper and in egg white mixture and then into puffed rice. When squash has lightly browned, about 20 minutes, push together at one end of sheet pan. Toss green beans with evoo and salt and pepper. Add green beans to sheet pan. Place fish on sheet pan, drizzle with 1 tablespoon oil and roast for 12 - 15 minutes, flipping once halfway through until fish is cooked through. Sprinkle with salt and pepper and serve.