Peach Cobbler with a Cinnamon Crust

INGREDIENTS

1/4 cup

all-purpose flour

1 cup

sugar

3/4 tsp

ground cinnamon, divided

6 cups

sliced peeled fresh ripe peaches or 2 (16-ounce) packages frozen sliced peaches

Cooking spray

2 tbsp

sugar

1 15 ounce package

refrigerated pie dough (such as Pillsbury)

large egg white, lightly beaten