Step 1: Prepare the Apple Filling

1. In a medium saucepan over medium heat, melt the butter.
2. Add the diced apples, brown sugar, cinnamon, and nutmeg. Stir to coat.
3. Cook for 5-7 minutes until the apples soften and release their juices.
4. If using cornstarch, mix it with 2 tablespoons of water to form a slurry. Stir it into the apple mixture and cook for another 1-2 minutes until thickened.
5. Remove from heat and stir in the vanilla extract. Let the filling cool slightly.

Step 2: Prepare the Biscuits

1. Preheat the oven to 375°F (190°C). Line a baking sheet with parchment paper.
2. Separate the biscuit dough and flatten each biscuit slightly.
3. Spoon about 1 tablespoon of the apple filling into the center of half of the biscuits.
4. Place the remaining biscuits over the filled ones and press the edges together to seal. Use a fork to crimp the edges for a better seal.

Step 3: Bake the Biscuits

1. Place the stuffed biscuits on the prepared baking sheet, leaving space between them.
2. Brush the tops with melted butter for a golden finish.
3. Bake for 15-18 minutes or until the biscuits are golden brown and cooked through.

Step 4: Prepare the Glaze (Optional)

1. In a small bowl, whisk together powdered sugar, milk, and vanilla extract until smooth.
2. Drizzle the glaze over the warm biscuits before serving.

Step 5: Serve and Enjoy

1. Serve warm with a dusting of cinnamon sugar, caramel drizzle, or a scoop of vanilla ice cream.
2. Enjoy your homemade Apple Pie Biscuits Recipe with coffee, tea, or as a sweet breakfast treat!