Ingredients
Equipment
Method
Instructions
- Get Ready: First things first, preheat your oven to 350°F (175°C). While it's heating up, grab a 9×13-inch baking dish and give it a light coating of grease. Butter or a non-stick spray works perfectly.
- Mix the Dry Goods: In a large bowl, whisk together the all-purpose flour, sugar, baking powder, baking soda, and salt. Whisking them now ensures everything is evenly distributed for a perfect rise.
- Mix the Wet Ingredients: In a separate, medium-sized bowl, whisk the buttermilk, large eggs, melted butter, and vanilla extract until they are smooth and well combined.
- Combine Gently: Pour the wet mixture into the bowl with the dry ingredients. Stir with a spatula until they are *just* combined. Remember, a few lumps are your friend here—do not overmix!
- Fold in Berries: Gently fold in your fresh or frozen blueberries. If using frozen, add them straight from the freezer to prevent the batter from turning purple.
- Pour and Spread: Transfer the finished batter into your prepared baking dish. Use your spatula to spread it into an even layer.
- Bake to Golden Perfection: Place the dish in the preheated oven and bake for 30–35 minutes. You'll know it's done when the top is a beautiful golden brown and a toothpick inserted into the center comes out clean.
- Rest and Serve: Let the casserole rest on a wire rack for about 10 minutes before slicing. This helps it set up properly. Serve warm, dusted with powdered sugar or drizzled with maple syrup.
Notes
Do not overmix the batter; a few lumps are fine. To prevent blueberries from sinking, toss them in a tablespoon of the dry flour mixture before adding. Use room temperature eggs and buttermilk for more even baking. If you don't have buttermilk, make a substitute by adding one tablespoon of white vinegar or lemon juice to two cups of regular milk and letting it sit for 5-10 minutes.
