Chicken Madeira On Herbed Biscuits

Ingredients

• 4 chicken breasts, boneless and skinless
• Salt and pepper, to taste
• 2 tablespoons olive oil
• 1 cup Madeira wine
• 1 cup chicken broth
• 1 cup heavy cream
• 2 tablespoons butter
• 2 cloves garlic, minced
• 1 tablespoon cornstarch
• 2 tablespoons water
• Fresh parsley, chopped, for garnish
• 2 cups all-purpose flour
• 1 tablespoon baking powder
• 1 teaspoon salt
• 1 teaspoon sugar
• 1/2 cup cold unsalted butter, cubed
• 1/2 cup fresh parsley, chopped
• 1/2 cup milk
• 1/4 cup sour cream