1. Preheat your oven to 375°F (190°C).
2. In a bowl, mix together the flour, sugar, baking powder, and salt.
3. In another bowl, combine the melted butter, milk, and vanilla extract.
4. Pour the wet ingredients into the dry ingredients and mix until just combined.
5. In a separate bowl, toss the diced peaches with cornstarch and cinnamon.
6. Roll out the dough and cut it into rectangles.
7. Place a spoonful of the peach mixture on one end of each rectangle and roll it up to form a cruffin.
8. Place the cruffins in a muffin tin and brush with egg wash.
9. Bake for 20-25 minutes or until golden brown.
10. Let cool before serving.

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