Crispy Portobellos With Marsala Sauce

Ingredients

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• ¼ cup all-purpose flour
• 2 large eggs
• ½ teaspoon salt, divided
• ½ teaspoon ground pepper, divided
• ½ cup panko breadcrumbs
• ½ cup grated Parmesan cheese
• 4 portobello mushrooms (about 14 ounces total), stems and gills removed
• 4 tablespoons extra-virgin olive oil, divided
• 2 cups sliced shallots
• 1 teaspoon chopped fresh thyme, plus more for garnish
• ½ cup low-sodium no-chicken broth
• ½ cup dry Marsala wine
• ¼ cup sour cream
• Chopped fresh parsley for garnish