Preheat oven to 400 degrees.
Optional: cook whole grain of choice and set aside.
First, get the sweet potatoes and green beans in the oven to roast. Place each vegetable on separate baking sheets. Season each with about 1 T. of olive oil and salt/pepper to taste.
Place baking sheets in the oven and roast for about 15-20 minutes, until veggies are softened and beginning to turn golden brown. (Check on vegetables after 10 minutes and every 5 minutes after that.) Flip/turn occasionally. The green beans will likely be ready before the sweet potato fries.
While vegetables are roasting, bring large sauté pan to medium heat. Add 1 tsp. of oil followed by the red onion. Cook onion low and slow until caramelized (soft and deep golden brown), about 15-30 minutes.
Preheat cast iron pan or grill to high heat. Season both sides of turkey patties with salt and pepper. Sear on both sides for 4-6 minutes. Finish in the oven if needed (until desired doneness), another 5-8 minutes.
Assemble plate with lettuce, tomato and burger topped with caramelized onion and avocado. Serve with roasted vegetables and whole grain if desired.
Enjoy!