Instructions:
Preheat oven to 350°F (175°C). Grease a 9×9-inch baking dish.
In a mixing bowl, combine flour, sugar, baking powder, and salt. Add milk, melted butter, and vanilla; stir just until combined.
Spread batter evenly in the dish.
In a separate bowl, mix brown sugar, sugar, and cinnamon. Sprinkle over the batter.
Pour hot water evenly over the top — do not stir!
Bake for 40–45 minutes, until golden brown and bubbly. A cinnamon-sugar sauce will form underneath!
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