Chicken with Florentine Sauce

Ingredients

• 6 boneless skinless chicken breast halves (4 ounces each)
• 1/2 cup grated Parmesan cheese
• 1/2 teaspoon dried basil
• 1/2 teaspoon dried oregano
• 3 tablespoons butter, divided
• 2 green onions, chopped
• 1 teaspoon minced garlic
• 1 tablespoon all-purpose flour
• 1/4 teaspoon salt
• 1/2 cup whole milk
• 1 tablespoon sherry or chicken broth
• 1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry
• 2 tablespoons diced pimientos
• 1/2 cup sour cream
• 1 cup shredded part-skim mozzarella cheese