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

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

Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.

In another bowl, whisk together the flour, baking soda, cinnamon, and salt.

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

In a separate bowl, combine the diced apples, granulated sugar, cinnamon, and lemon juice. Toss until the apples are well coated.

In a bowl, mix together the oats, flour, brown sugar, melted butter, and cinnamon until crumbly.

Drop spoonfuls of the cookie base onto the prepared baking sheet, leaving space between each cookie.

Top each cookie with a spoonful of the apple filling, then sprinkle the crisp topping over the apples.

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

Allow to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.