Ghirardelli Double Chocolate Muffins Recipe

Ingredients

• cooking spray
• 2 cups all-purpose flour
• 1 cup Ghirardelli 100% Dutch-Process Cocoa
• 2.5 teaspoons baking powder
• 0.75 teaspoon salt
• 0.5 teaspoon baking soda
• 2 large eggs
• 1 large egg yolk
• 1.5 cups granulated sugar
• 0.5 cup vegetable oil
• 1.5 cups sour cream
• 1 tablespoon vanilla extract
• 1 (11 ounce) package Ghirardelli Grand Semi-Sweet Chips, divided
• 2 teaspoons coarse sugar, or as needed