Cream Cheese Stuffed Pastries with Cinnamon Sugar

1. In a large bowl, combine the flour, baking powder, 1 teaspoon sugar, and 1 teaspoon salt. Cut in the unsalted butter until crumbly. Gradually add the whole milk, mixing until a soft dough forms. 
2. Chill the dough in the fridge for 15-30 minutes. 
3. While the dough chills, prepare your cream cheese filling (you may want to soften it slightly or mix with a touch of sugar if desired, though not specified). 
4. Once chilled, roll out the dough and cut into desired shapes (e.g., squares or circles). Place a spoonful of cream cheese in the center of each piece of dough and fold over, sealing the edges to form a pocket. 
5. To cook in an Air Fryer: Preheat to 400°F (200°C). Air fry the pastries for 8-9 minutes, or until golden brown and cooked through. 
6. To cook in an Oven: Preheat to 375°F (190°C). Bake for approximately 10-15 minutes, or until golden brown. 
7. While the pastries are still warm, combine 2 parts sugar and 1 part cinnamon (e.g., 1/2 cup sugar to 1/4 cup cinnamon) in a shallow dish. Roll or sprinkle the warm pastries generously with the cinnamon sugar mixture.