Cookie Monster Cake - Recipe Tweets

Ingredients

• 2 1/2 cups cake flour
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon salt
• 3/4 cup unsalted butter
• 1 3/4 cups granulated sugar
• 5 large egg whites, at room temperature
• 1/2 cup sour cream
• 1 tablespoon pure vanilla extract
• 3/4 cup whole milk
• 1 cup mini chocolate chips
• 6 1/4 cups confectioners' sugar
• 1/3 cup whole milk or heavy cream
• blue and black gel food coloring
• 4 ounces white chocolate bar
• 1/2 teaspoon vegetable oil or coconut oil