"Portobello mushrooms are stuffed with a mixture of spinach, onions, garlic, and parmesan. They're so tasty and surprisingly easy to make...."
INGREDIENTS
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4 portobello mushroom caps
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olive oil cooking spray
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1 teaspoon Diamond Crystal kosher salt (divided)
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1/4 teaspoon black pepper (divided)
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10 oz frozen chopped spinach
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2 tablespoons olive oil
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1 small onion (finely chopped (6oz))
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1 tablespoon minced fresh garlic
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1/4 cup dry-grated Parmesan