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Preheat the oven to 400 degrees F (200 degrees C). Grease a 9-inch square baking dish.
Make the cake: Mix baking mix, milk, egg, sugar, and cinnamon together in a bowl until well combined; spread into the bottom of the prepared baking dish.
Make the topping: Mix baking mix, brown sugar, butter, and cinnamon together in a separate bowl using a fork or pastry blender until crumbly. Sprinkle evenly over batter, then drag a butter knife across the top in a crisscross pattern.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 25 minutes.