S'mores Donuts

Name: S'mores Donuts
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Thai, Asian
Ingredients: 1 1/3 cup cake flour (substitute all purpose flour); 1/2 cup unsweetened cocoa powder; 2 tablespoons graham cracker crumbs; 2 teaspoons baking powder; 1/4 teaspoon salt; 1/2 cup vegetable oil; 1/2 cup granulated sugar; 1/2 cup brown sugar; 2 large eggs (room temperature); 1 teaspoon vanilla extract; 1/2 cup whole milk; 6 ounces dark chocolate (chopped); 1 tablespoon unsalted butter; 2 tablespoons heavy cream; mini marshmallows; graham cracker crumbs