Portobello Swiss Cheese Burgers with Caramelized Onions

Portobello Swiss Cheese Burgers with Caramelized Onions

Portobello Swiss Cheese Burgers with Caramelized Onions


29 minutes

Ingredients
  • 2 teaspoons olive oil
  • 1 onion, thinly sliced (about 1 cup)
  • 1 teaspoon sugar
  • 1 tablespoon balsamic vinegar
  • 4 portobello mushroom caps (about 3 1/2-4 ounces each)
  • teaspoon salt
  • 1/4 teaspoon ground black pepper
  • 4 slices reduced-fat swiss cheese (about 2 ounces total)
  • 4 light multigrain english muffins, (100 calories each), such as thomas', split
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