Preheat your oven to 375°F (190°C). Lightly grease a 9-inch pie dish with butter.

Scatter the blueberries evenly in the bottom of your greased baking dish. If using frozen blueberries, use them directly from frozen.

In a medium-sized bowl, whisk together the flour, sugar, and salt.

In another bowl, whisk together the eggs, milk, and vanilla extract until well combined.

Slowly pour the wet ingredients into the bowl with the dry ingredients, whisking continuously until smooth.

Pour in the melted butter to the batter and whisk again until fully incorporated.

Gently pour the batter evenly over the blueberries in the baking dish.

Bake in the preheated oven for 40-50 minutes, or until the clafoutis is set and lightly golden brown.

Let the Blueberry Clafoutis cool for about 10-15 minutes before serving.