Portobello Swiss Cheese Burgers with Caramelized Onions

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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