Swiss Mushroom Burgers

  4.0 – 8 reviews  • Beef Level: Easy Total: 25 min Prep: 17 min Cook: 8 min Yield: 4 servings Ingredients 1 1/4 pounds ground beef (preferably chuck) Kosher salt and freshly ground pepper 2 teaspoons extra-virgin olive oil, plus more for brushing 1 small red onion, halved and thinly sliced 1 8-ounce package sliced mixed … Read more