Ingredients
Equipment
Method
Prep and mix
- Preheat oven to 375°F and grease a 9x13 baking dish so the casserole releases cleanly after baking.
- Whisk all-purpose flour, sugar, baking powder, baking soda, and salt together until evenly combined and no lumps of leaveners remain.
- Whisk buttermilk, eggs, melted butter, and vanilla extract together until smooth, then stir into the dry ingredients until just combined.
Bake
- Pour the batter into the prepared dish and scatter blueberries evenly across the top so they bake into the golden surface.
- Bake at 375°F for 35–40 minutes until the center is set and the top is golden and lightly springy.
Serve
- Dust with powdered sugar for a light finish, then slice into squares to serve.
- Serve with warm maple syrup drizzled across the top so each square gets glossy, syrupy coverage.
Notes
Pro tip: If using frozen blueberries, keep them cold and add them straight from the freezer so they don’t bleed too much color into the batter. Store leftovers covered in the fridge for up to 3 days; reheat in the oven or microwave until warmed through. Freezing is yes—wrap portions and freeze up to 2 months, then thaw overnight in the fridge and rewarm. For a dairy-free swap, use a dairy-free buttermilk alternative and plant-based butter in the same amounts.
