In a heavy-bottomed saucepan, combine water, butter, 2 tbsp sugar, and salt. Heat over medium-high until butter melts and mixture comes to a rolling boil.

Remove saucepan from heat. Add sifted flour all at once and stir vigorously until a thick, smooth dough ball forms. Return to low heat and stir for 1-2 minutes, pressing dough against sides of the pan, until a thin film forms on the bottom.

Transfer hot dough to a large mixing bowl and let cool for 5-7 minutes. Add eggs one at a time, beating thoroughly after each until fully incorporated, and the dough is glossy, smooth, and holds a thick 'V' shape when lifted.

Transfer the prepared churro dough into a large piping bag fitted with a large star tip.

Heat 4-6 cups vegetable oil in a deep, heavy-bottomed pot to 350-360°F (175-180°C). Line a baking sheet with paper towels. In a shallow dish, whisk together ½ cup granulated sugar and 1 tbsp ground cinnamon for the coating.

Carefully pipe 1 to 1½-inch long pieces of dough directly into the hot oil, cutting with kitchen shears. Fry 6-8 nuggets per batch for 2-3 minutes, turning occasionally, until golden brown and crispy. Do not overcrowd the pot.

Remove fried nuggets with a slotted spoon, drain excess oil briefly, then immediately toss them generously in the cinnamon sugar mixture. Repeat for remaining dough, ensuring oil temperature returns to 350-360°F before each new batch.

Crush graham cracker sheets into fine crumbs. Melt chocolate chips using a double boiler or microwave, stirring until smooth; keep warm.

Arrange warm, cinnamon-sugar churro nuggets on a serving platter. Drizzle generously with melted chocolate. Scatter mini marshmallows over the chocolate.

For a toasted effect, place assembled nuggets under a preheated broiler for 1-2 minutes (watch constantly) or use a kitchen torch until marshmallows are lightly golden and gooey. Alternatively, the residual heat will soften them.

Generously sprinkle crushed graham cracker crumbs over the toasted marshmallows and chocolate. Serve immediately while warm for the ultimate Smores Churro Nugget experience.