Whisk egg, milk, salt, and sugar together in a bowl. Add semolina flour and whisk until combined.
Heat 1 teaspoon oil in a griddle or pan over medium heat. Drop ladlefuls of batter in batches into the hot pan and fry until set and golden, 2 to 4 minutes, flipping halfway. Remove from the pan and let cool enough to handle, about 5 minutes.
Roll up pancakes and thinly slice into "noodles."
Heat remaining 2 teaspoons olive oil in the same pan over medium heat. Add pepper flakes and "noodles." Pan-fry until almost crisp, 2 to 4 minutes.