Double Chocolate Muffins

Ingredients

• 2 cups All Purpose Flour
• 1 cup Ghirardelli 100% Dutch-Process Cocoa
• 2 1/2 teaspoons Baking Powder
• 1/2 teaspoon Baking Soda
• 3/4 teaspoon Salt
• 2 eggs plus 1 egg yolk
• 1 1/2 cups granulated sugar
• 1/2 cup vegetable oil
• 1 1/2 cups Sour Cream
• 1 tablespoon vanilla extract
• 11 oz. Ghirardelli Grand Semi-Sweet Chips, divided
• Coarse Sugar, for tops