Make the crisp topping first. In a large bowl, add the flour, oats, baking powder, cinnamon, salt, brown sugar, chopped pecans, vanilla, and cold grated butter. I used a box grater to grate my butter. Use your clean hands to combine everything together well. Note: I usually keep the grated butter in the fridge while adding all the dry ingredients, then add it last. The colder the better!
Set the crisp topping aside in the fridge. You want to keep the butter as cold as possible before baking.
Peel, core, and slice the apples into 1/2 inch slices. Then add them into an extra large bowl along with the rest of the filling ingredients.
Use your hands to mix everything together well.
Transfer the mixed apple filling into a 9x13 inch baking dish. Flatten and smooth the apples out for even baking.
Now evenly sprinkle the crisp topping over the apples.
Bake at 350 degrees Fahrenheit for about 45-50 minutes or until the top of the crips in golden and lightly browned. Serve warm with vanilla ice cream on top. I added a little caramel drizzle too but that’s totally optional.
Notes
Use cold butter- Not only does this make it loads easier to grate, but it will also not melt right away in the oven. This keeps your oat topping crumbly instead of mushy.
Store the topping in the fridge- If you are taking your time getting the apples prepped after making the crumbly topping, place it in the fridge to keep the butter from melting.
Allow the crisp too cool- Letting the apple crisp cool before cutting and serving helps it hold its shape as it can be almost liquidy when hot from the oven.