Apple Cinnamon Streusel Galette

INGREDIENTS

1 3/4 cups

all-purpose Gold Medal flour

1/3 cup

granulated sugar

1/4 cup

coarse cornmeal

1/4 tsp

salt

1/2 cup

cold butter, cut into small pieces

1/3 cup

buttermilk

large Granny Smith apples, peeled, cored, and thinly sliced

For the Cinnamon Streusel Topping:

1/4 cup

all-purpose Gold Medal Flour

1/4 cup

light brown sugar

1 tsp

ground cinnamon

4 tbsp

cold butter

egg, beaten

2 tbsp

turbinado sugar