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In a small bowl, whisk together the flour, granulated sugar, Milk Hot Chocolate Mix, baking powder, and salt.
Add the hot water, vegetable oil, and vanilla extract. Stir together with a whisk or fork until no clumps of flour remain.
Pour the batter into a 12 oz or larger microwave-safe mug and sprinkle the chocolate chips over the top.
Microwave for 60 seconds. Check doneness by inserting a toothpick into the center of the cake. If it comes out mostly clean with a few moist crumbs (could be a melted chocolate chip), the mug cake is ready. If the batter is still liquid in the center, microwave for an additional 15 seconds, then retest with a toothpick. Repeat until cooked through.
Let the cake cool for a few minutes, then top with your favorite toppings and enjoy!