Sprinkle Explosion Cake

Ingredients: 2 cups all-purpose flour 2 cups granulated sugar 1 cup whole milk 3/4 cup unsweetened cocoa powder 2 teaspoons baking powder 1 1/2 teaspoons baking soda 1 teaspoon salt 1/2 cup vegetable oil 2 large eggs 2 teaspoons vanilla extract 1 cup boiling water 1 cup semisweet choc