Ring-My-Bella Mushroom Sandwich

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1 large portabella mushroom, stem removed

1 thick slice red onion, all rings intact

1 teaspoon extra-virgin olive oil

1/8 teaspoon salt

2 dashes ground thyme

1 stick light string cheese

1 tablespoon fat-free mayonnaise

Dash cayenne pepper

One 100-calorie flat sandwich bun

1 teaspoon light whipped butter or light buttery spread, room temperature

2 dashes garlic powder

1 large slice tomato

1/2 cup shredded lettuce