In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt. This ensures the dry ingredients are evenly distributed.
In a separate bowl, whisk the eggs, then add the milk and vanilla extract. Mix thoroughly until well combined.
Pour the wet ingredients into the dry ingredients and mix until just smooth. The batter should be slightly thick but still pourable.
Add the raisins and gently fold them into the batter until evenly distributed.
In a medium saucepan, heat the oil to 340-355ツーF (170-180ツーC). If you don't have a thermometer, drop a small amount of batter into the oil: if it slowly sizzles and browns, the oil is ready.
Using a tablespoon, drop small balls of batter into the hot oil. Fry 4-5 at a time to prevent the oil temperature from dropping too quickly.
Fry the doughnuts for about 3-4 minutes, turning occasionally, until golden brown and cooked through.
Remove the fried doughnuts and place them on a paper towel-lined plate to drain excess oil.
Serve warm, dusted with powdered sugar or with your favorite jam.
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