Ingredients
- 8 ounces mushrooms, large ones halved
- 1 tablespoon extra-virgin olive oil plus 2 teaspoons, divided
- 2 tablespoons red-wine vinegar plus 2 teaspoons, divided
- 1 teaspoon garlic powder
- 1 teaspoon smoked paprika
- 1 medium red onion, sliced into 1/2-inch-thick rings
- ½ teaspoon salt, divided
- 1 pound ground bison or 90%-lean ground beef
- 3 ounces sliced dill havarti cheese
- 4 whole-wheat hamburger buns, toasted
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