Toss the chopped brussel sprouts, sweet potatoes, and carrots in the olive oil. Season with salt and black pepper to taste. Roast in the air fryer at 400F for 15-20 minutes, or in the oven at 425F for 12-15 minutes.
To Make the Tuna Patties:
While the veggies roast, combine all ingredients in a bowl. Mash all together with a fork until very well combined. Form into 3-4 patties. (If you find your tuna patties difficult to work with, add more flour as needed).
Add a drizzle of olive oil to a skillet over medium high heat. Add the patties to cook 2-3 minutes on each side, until crispy and golden brown.
To Assemble the Harvest Bowl:
In a dinner bowl, add the arugula and cooked quinoa. Top with the tuna patties, roasted veggies, chopped apples, crumbled feta, and pickled onions. Drizzle with the vinaigrette to enjoy!