Combine flour, sugar, and salt in a bowl.

In a separate bowl, beat egg lightly.

Add milk and oil to the egg mixture.

Pour the wet ingredients into the dry ingredients and stir until smooth.

Fold in the thinly sliced apples.

Heat a lightly greased griddle or frying pan over medium heat.

Pour 1/2 cup of batter onto the hot griddle, spreading it into a 5-inch circle.

Cook until bubbles form on the surface and the edges are set.

Flip the pancake and cook until golden brown and the apples are tender.

Repeat with the remaining batter.

Sprinkle with powdered sugar before serving.