7 Tablespoons unsalted butter

1/3 cup whole milk

1 large egg

1 large egg yolk

1 teaspoon vanilla extract

1 1/2 cups all-purpose flour

3/4 cup sugar

1 1/2 teaspoons baking powder

3/4 teaspoon salt

2 cups fresh blueberries

For the Topping:

3 Tablespoons cold, unsalted butter, cut into 1/2-inch cubes

1/2 cup all-purpose flour

3 1/2 tablespoons sugar