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Place oil in the dutch oven and insert the candy thermometer. Heat the oil over medium heat until it reaches 375 F. If you’ve just made the corn dogs, you can reuse the oil. Just remove any leftover bits of cooked batter from the corn dogs.
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In a medium bowl, whisk together the milk, water, eggs, and vanilla.
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Add the sugar, baking powder, and salt. Whisk until combined.
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Add the flour and whisk until smooth.
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Transfer the batter to a liquid measuring cup so that it’s easy to pour.
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Once the oil is ready, drizzle about a ½ cup of the batter into the oil, making sure to overlap and swirl the lines of batter over each other.
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Cook for 2 minutes or until light golden. Flip the funnel cake over and cook for another 2 minutes.
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Remove funnel cake from the oil, gently shaking off excess oil, and transfer to a plate.
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Repeat steps with remaining batter until all funnel cakes are cooked.
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Dust funnel cakes with powdered sugar and serve.