Spider Web Brownies - Walter Stewart's Market

Ingredients

• 4 large eggs
• 1 1/4 cups Double-Dutch Dark Cocoa or Dutch-process cocoa
• 1 teaspoon salt
• 1 teaspoon baking powder
• 1 teaspoon espresso powder
• 1 tablespoon vanilla extract
• 1 cup (2 sticks) unsalted butter
• 2 1/4 cups sugar
• 1 1/2 cups King Arthur Unbleached All-Purpose Flour
• 2 cups chocolate chips
• 4 ounces cream cheese, at room temperature
• 2 tablespoons sugar
• 1 tablespoon King Arthur Unbleached All-Purpose Flour
• 1 large egg yolk
• 1/2 teaspoon mint flavoring (optional)