Veggie-Loaded Beef Burgers

First, sauté the 1/2 diced onion, 1/2 cup chopped mushrooms, and 1/2 cup chopped spinach in olive oil for 5 minutes. In a separate bowl, combine the sautéed vegetables with 1 lb ground beef, 1 tsp garlic, 1/2 tsp onion powder, 1 tsp chili powder, and a sprinkle of salt. Mix well and form into 7 burger patties. Cook the burgers over medium heat in olive oil for 5 minutes on each side. Finish by placing them in an oven preheated to 425F for another 5 minutes. Always check the internal temperature to ensure they are fully cooked.