1. Preheat oven to 425°.
2. Combine first 4 ingredients (through salt) in a large bowl, stirring with a whisk. Add peaches; toss gently to coat with sugar mixture.
3. Fit one-half of dough into a 9-inch pie plate coated with cooking spray. Cut remaining half of dough into 10 (3/4-inch-wide) strips, reserving remaining dough for another use.
4. Spoon peach filling into prepared crust. Arrange dough strips in a lattice pattern on top of filling. Turn edges under; flute. Brush dough with milk, and sprinkle with turbinado sugar.
5. Bake at 425° for 30 minutes, shielding edges of piecrust with foil after 20 minutes. Reduce oven temperature to 375°. Bake an additional 15 minutes or until golden and bubbly. Cool on a wire rack at least 2 hours before cutting.