Whisk the flour, baking powder, 2 tbsp granulated sugar, and salt together in a medium bowl, then add the milk, egg, melted butter, and vanilla extract and stir until just combined with a few small lumps remaining.

Heat the vegetable oil in a medium heavy-bottomed saucepan over medium to medium-high heat until it reaches 350°F (175°C).

Drop 1.5-tbsp rounds of batter into the oil in batches of 4 to 5, fry for 3 to 4 minutes turning every 30 to 45 seconds until deep golden brown all over, then drain on paper towels.

While still hot, toss the fried balls in a shallow bowl with the 1/2 cup granulated sugar and 1 tsp cinnamon, plate them, and serve immediately with maple syrup or dipping sauce alongside.