• Preheat oven to 375°.
• Butter a 9x13-inch baking dish or individual dishes on the bottom and sides.

Apple Instructions

• Peel apples, quarter them, and slice each quarter into 3 chunks or slices.
  
• Toss apples with 3 tablespoons of lemon juice, then sprinkle with cinnamon and 1/3 cup brown sugar and stir to combine. Set aside.

Crumble Instructions

• Mix 1 cup brown sugar, oats, and gluten-free flour with a spoon.
• Next, add cold cubes of butter individually to the bowl, not in clumps. Smash each cube of butter into the oatmeal mixture with your fingers until it all starts to come together into chunks of cookie dough-like form.
• Place your prepped apple mixture into the prepared baking dish or dishes.
  
• Next, crumble your topping onto the apples, pressing and creating a top for each baking dish. As you pick up the topping, gather extra crumbs in the bottom of the bowl and continue to mix into butter clumps as needed. Spread evenly over your apples by pinching off pieces, pressing down lightly as you work to fit all the crumble on top.
  
• If you are using individual baking dishes or ramekins, put them on a baking sheet for easy removal from the oven and to catch any drips.
  
• Bake for 50-55 minutes or until the topping is bubbly and lightly browned on top.