Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a mixing bowl, whisk together the flour, oats, baking soda, cinnamon, and salt.

In another bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.

Add the egg and vanilla extract, mixing until well combined.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in the diced apples.

Drop tablespoonfuls of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Bake in the preheated oven for 10-12 minutes, or until the edges are golden.

Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.

Once cookies are cooled, drizzle with caramel sauce before serving.