INGREDIENTS
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For the mushrooms
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4 large (4 1/2-inch diameter) portobello mushrooms, or 24 small "baby bellas" (2 1/2-inch diameter), cleaned, gills and stems removed
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2 tablespoons olive oil
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2 medium (1 1/2 pounds) yellow onions, cut in half, then into 1/4-inch slices
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Salt
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Freshly ground black pepper
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Leaves from 1/2 small bunch of thyme (2 tablespoons)
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1/2 teaspoon garlic powder
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For the topping
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2 ounces Manchego cheese, finely grated (2/3 cup)
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1/4 cup regular or low-fat mayonnaise (do not use nonfat)