Preheat grill to medium heat or preheat oven to 450 degrees F.
Prepare four pieces of non-stick foil, approximately 12x18" in size.
In a medium sized bowl, combine diced apples and lemon juice. Add in cornstarch, sugars, Great Value Ground Cinnamon and butter. Mix to combine well. Set aside.
Next, in a separate bowl, combine oats, flour, brown sugar and Great Value Ground Cinnamon. Mix well.
Add butter to mixture and cut in with a pastry cutter or two forks.
Place half of the apple mixture onto the center of one of the pieces of non-stick foil, making sure the mixture is touching the non-stick side. Sprinkle half of the crumb mixture over the apples.
Seal foil packet tightly, making sure all sides are securely closed. Repeat with a second piece of foil. Repeat with remaining ingredients.
Place on grill or over campfire for approximately 8-12 minutes, or place on a cookie sheet and bake in oven for approximately 15 minutes. Times are approximate as grill and campfire heating is harder to regulate than an oven.
Remove from heat and allow to cool for approximately 10 minutes. Carefully open foil packets as they will be very hot. Top with a scoop of ice cream, serve, share and enjoy.