In a large mixing bowl, whisk together 2 cups of all-purpose flour, 1/4 cup of sugar, 1 tablespoon of baking powder, 1/2 teaspoon of baking soda, and 1/2 teaspoon of salt until well combined.

Using a pastry cutter, cut in 1/2 cup of chilled, unsalted butter until the mixture resembles coarse crumbs.

Stir in 3/4 cup of cold buttermilk, 1 cup of peeled and diced apples, and 1 teaspoon of cinnamon until just combined.

In a separate bowl, beat 8 ounces of softened cream cheese and 1/4 cup of sugar together with an electric mixer until smooth and creamy.

Add in 1 large egg and 1 teaspoon of vanilla extract, mixing until fully combined.

Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.

On a lightly floured surface, roll the dough out to about 1/2 inch thick, and cut it into squares.

Place a tablespoon of the cheesecake filling in the center of each square, then fold and seal the corners tightly.

In a bowl, mix 1 cup of rolled oats, 1/2 cup of brown sugar, 1/4 cup of melted butter, and 1 teaspoon of cinnamon until crumbly.

Arrange the assembled buns on the prepared baking sheet, sprinkle with crumble topping, and bake for 20-25 minutes.

Let them cool on the baking sheet for about 10 minutes before serving.