Mushroom Stuffed Mushrooms Are an Umami Rich Twist on an Iconic Dish

Ingredients

• 4 large (4-inch wide) portobello mushrooms
• 3 tablespoons olive oil, divided
• 1/2 teaspoon kosher salt, divided
• 1/2 teaspoon freshly ground black pepper, divided
• 1 small yellow onion
• 1/2 large lemon
• 2 ounces whole-milk low-moisture mozzarella cheese, shredded (about 1/2 cup)
• 1/2 ounce Parmesan cheese, grated (about 2 tablespoons)
• 2 tablespoons panko bread crumbs
• 1 (10.5-ounce) can Campbell’s® Condensed Cream of Mushroom Soup
• 1 (5-ounce) bag baby spinach (about 5 cups)

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