Preheat the oven to 400 F and grease your baking dish.
Arrange the berries in your baking dish.
Whisk the eggs, flour, sugar, milk, salt, and vanilla together to form a smooth batter, and then pour the batter over the fruit. Bake for about 25 minutes, or until the center of the custard trembles slightly when you jiggle the pan. Serve warm.