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In a medium saucepan, combine water, butter, salt, and ground cinnamon over medium heat. Bring to a rolling boil.
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Reduce the heat to low and add the flour. Using a wooden spoon, stir vigorously until mixture forms a ball. Remove from the heat and let rest for 5-7 minutes.
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Add eggs, one at a time, stirring after each addition. Stir until combined and set aside.
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Heat oil in a medium skillet, pan, or dutch oven over medium-high heat until the temperature of the oil reaches 350 F.
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Transfer the dough to the large piping bag fitted with a large star tip. Pipe a 2-3 inch strip of dough over the oil, cut the end with a sharp knife or kitchen shears, and drop the dough into the oil. Repeat until churros fill the saucepan with room to fry.
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Fry the churros until golden brown, rotating occasionally. Remove from the oil using a heat-proof slotted spoon or mesh spider strainer.
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Drain the churros on a plate lined with paper towels.
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Mix sugar and ground cinnamon in a medium bowl. Toss churros until coated.
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Transfer to a serving plate and drizzle with Nutella and sprinkle with freeze-dried strawberries.