Peach Crumb Bars

INGREDIENTS

4 1/2 cups

peaches (, peeled, pitted and diced (about 8 small peaches, use firm but ripe))

1 3/4 cups

granulated sugar (, divided)

3 1/2 tbsp

cornstarch

1/2 tsp

cinnamon

1/4 tsp

nutmeg

1/4 tsp

ginger

2 tbsp

orange juice

1 tsp

orange zest ((optional))

3 cups

all-purpose flour

1 tsp

baking powder

1/2 tsp

salt

3/4 cup

salted butter (, cold and diced into cubes)

large egg

1/4 cup

sour cream

1 1/2 tsp

vanilla extract

1 tbsp

Turbinado sugar ((optional))