Directions
Preheat your oven to 350°F (175°C). Lightly butter or spray a 2-quart oven-safe white ceramic casserole dish; an 8x8-inch or similar size works well.
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Dump the frozen raw whole blueberries straight into the prepared casserole dish. They should be evenly spread in a single, fairly even layer. It’s fine if you can see ice crystals clinging to the berries—that’s exactly how you want them.
Sprinkle the granulated sugar evenly over the frozen blueberries. Don’t stir; just let the sugar sit on top so it can melt down into the berries as they bake.