01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a small bowl, mix oats, flour, brown sugar, and cinnamon. Cut in cold butter using a fork or your fingertips until the mixture resembles coarse crumbs. Refrigerate until needed.
03 - In a medium bowl, whisk together flour, baking soda, salt, and cinnamon. Set aside.
04 - In a large bowl, cream together softened butter, brown sugar, and granulated sugar until light and fluffy, about 2 minutes.
05 - Beat in eggs, one at a time, then add vanilla extract.
06 - Gradually add the dry ingredients to the wet mixture and mix until just combined.
07 - Stir in oats, raisins, and diced apple until evenly distributed.
08 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing 2 inches apart.
09 - Sprinkle a generous pinch of crumble topping onto each cookie.
10 - Bake for 12-14 minutes, or until edges are golden and centers are just set.
11 - Cool on baking sheet for 5 minutes, then transfer to a wire rack to cool completely.