Chicken Parmesan with Spinach in Portobello - Yummy Gusto

Ingredients

• 6 large portobello mushroom caps, cleaned and stems removed
• 1 pound ground chicken, 93% lean
• 10 ounces frozen spinach, defrosted and excess liquid removed
• ½ cup grated Parmesan cheese, plus more for garnish
• ⅓ cup fresh parsley, finely chopped, plus more for garnish
• 1 medium onion, very finely chopped
• 1 egg
• 6 garlic cloves, minced
• ½ teaspoon onion powder
• 1 teaspoon salt
• 1 teaspoon black pepper
• 4 ounces shredded Italian cheese blend or shredded mozzarella
• 2 cups marinara sauce, low sugar preferred