Line 12 muffin cups with liners. Spray the liners with non-stick spray.
Combine the graham crumbs, melted butter, and brown sugar in a medium sized bowl. Spoon a little of this mixture into each of the muffin cup liners. Press it evenly into the bottom of the cups.
2 cups graham crumbs, 1/2 cup salted butter, 1/4 cup brown sugar
Use a stand mixer (or hand mixer) to cream the cream cheese. Then add the greek yogurt, egg, caramel sauce, brown sugar, vanilla, and cinnamon. Mix this until smooth.
8 ounces cream cheese, 2 tablespoons Greek yogurt, 1 egg, 1/4 cup caramel sauce, 1/4 cup brown sugar, 1 teaspoon vanilla, 1/4 teaspoons cinnamon
Spoon the cheesecake mixture evenly over the crusts in each of the muffin cups.
Peel, core, and dice the apples. Measure the brown sugar and cinnamon into a medium size bowl and combine them well. Then add the diced apples and stir to coat them well. Set this aside.
2 granny smith apples, 2 tablespoons brown sugar, 1/2 teaspoon cinnamon
In a separate, large bowl, whisk together the flour, brown sugar, rolled oats, and cinnamon. Then use a pastry cutter to cut in the softened butter until the mixture is crumbly.
1/3 cup flour, 1/3 cup brown sugar, 1/2 cup rolled oats, 1 teaspoon cinnamon, 6 tablespoons salted butter
Spoon a little of the apple mixture into each muffin cup. Then spoon on a little of the topping.
Bake for 30 minutes.
Chill for at least 2 hours. Garnish with whipped cream if desired.