Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, toss the diced apples with lemon juice and 1/2 teaspoon cinnamon; set aside.
In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.
Beat in the eggs one at a time, then stir in the vanilla extract.
Whisk together the flour, salt, baking cinnamon, baking soda, and baking powder in a separate bowl.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Scoop dough into 1.5-tablespoon portions and roll into balls, placing them onto the prepared baking sheet.
Use your thumb or the back of a spoon to create a small indentation in the center of each cookie.
Place a teaspoon of the apple mixture into the center of each indentation.
Bake for 12-15 minutes or until the edges are lightly golden and the centers are set.
Allow to cool on the pan for 5 minutes before transferring to a wire rack.