Step 1 Spray bottom and side of 9 or 10-inch (23 or 25 cm) quiche dish, deep pie plate, or cake pan with cooking spray. Spread blueberries in dish. Set aside.
Step 2 Combine eggs, sugar and butter in medium bowl; whisk until blended. Add flour and salt; whisk until blended and smooth. Add milk and vanilla; whisk until smooth. Batter will be thin. Pour batter over blueberries.
Step 3 Bake in preheated 375°F (190°C) oven until set and golden brown, about 35 minutes.
Step 4 Remove from oven and let cool for 20 minutes. The clafouti will deflate a little as it cools. Sprinkle with icing sugar. Cut into wedges. Serve topped with a dollop of whipped cream.