Step 1

Whisk eggs and salt together in a bowl. Gradually stir flour into eggs, alternately with 2 cups milk until fully incorporated. Beat 1/4 cup vegetable oil and 1/2 teaspoon cinnamon into flour mixture. Refrigerate batter for at least 1 hour.

Step 2

Mix apples, sugar, 2 teaspoons cinnamon, and 2 tablespoons water in a pot.

Step 3

Whisk cornstarch and 1 tablespoon water in a small bowl; pour into apple mixture.

Step 4

Simmer apple mixture over medium heat, stirring often, until thickened, 8 to 10 minutes. Keep warm.

Step 5

Whisk 1 1/2 tablespoons milk into chilled batter.

Step 6

Heat about 1 teaspoon vegetable oil in a crepe or frying pan over medium heat. Pour about 1/3 cup batter into the heated oil; tip and rotate the crepe pan until the batter covers the entire area. Cook until the edges begin to curl away from the sides of the pan, about 30 seconds; flip the crepe and continue cooking until lightly golden on the other side, about 30 more seconds. Remove crepe from pan, add more oil, and repeat with remaining batter.

Step 7

Spoon the apple filling into each crepe; fold crepe over the filling and serve.