Heat the oil in a medium saucepan over medium heat until it reaches about 375 degrees F.
In a large bowl, mix together the sugar and cinnamon. Set aside.
Separate the biscuits, then gently press and elongate into 1/3-inch-thick rectangles. Cut each rectangle into 1/4-inch slices--you should get about 8 long slices per biscuit. Twist the ends of each slice in opposite directions 4 times.
Fry the churros in batches, stirring and flipping as needed, about 30 seconds per batch.
Remove the churros to a paper-towel-lined baking sheet to drain, then toss in the cinnamon sugar.