INGREDIENTS
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4 large portobello mushroom caps
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1/4 teaspoon salt
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1/4 teaspoon freshly ground pepper, divided
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1 cup part-skim ricotta cheese
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1 cup finely chopped fresh spinach
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1/2 cup finely shredded Parmesan cheese, divided
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2 tablespoons finely chopped kalamata olives
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1/2 teaspoon Italian seasoning
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3/4 cup prepared marinara sauce