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Grease large mug with cooking spray.
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In mug, whisk together flour, sugar, baking powder, cinnamon and salt. Add milk, butter and vanilla, and stir until fully combined.
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Sprinkle top with another pinch of brown sugar and cinnamon. Microwave 1 to 2 minutes, checking after 30 seconds, until the cake is firm in the center and cooked through.
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In small bowl, whisk together powdered sugar, milk and salt until pourable. If needed, add more milk to reach your desired consistency.
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Pour glaze over warm mug cake and enjoy.