Step 1

Preheat oven to 350°F. Generously coat a 2-quart baking dish with butter and dust with 1 tablespoon sugar.

Step 2

Process eggs, milk, melted butter, and remaining 4 tablespoons sugar in a blender until smooth, about 1 minute. Add flour and salt and pulse until well combined, about 15 pulses.

Step 3

Spoon batter into prepared baking dish. Arrange berries and cherries over batter. Bake until custard is puffed and just set in center, about 45 minutes. Remove from oven; let cool for about 10 minutes before serving.