Blueberry Buckle

INGREDIENTS

Buckle

1/2 cup

unsalted butter, room temperature, plus more for pan

2 cups

all-purpose flour, plus more for pan

1 1/2 tsp

baking powder

1/2 tsp

salt

3/4 cup

sugar

large egg

1 tsp

pure vanilla extract

1/2 cup

milk

5 cups

wild or cultivated fresh blueberries

Streusel Topping

1 cup

all-purpose flour

1/4 cup

packed light-brown sugar

1 tsp

ground cinnamon

1/4 tsp

salt

6 tbsp

unsalted butter, room temperature