01 -
In a medium saucepan, combine 3 cups of blueberries, sugar, and lemon juice. Cook over medium heat, stirring occasionally, until simmering and sugar is dissolved.
02 -
Whisk cornstarch with 1 tablespoon of cold water. Slowly pour into the simmering blueberry mixture, stirring constantly. Cook for 1-2 minutes, until thickened.
03 -
Remove from heat and gently fold in the remaining 1 cup of fresh blueberries. Set aside to cool slightly.
04 -
In a large bowl, whisk together flour, baking powder, baking soda, salt, and sugar.
05 -
In a separate bowl, whisk together eggs, buttermilk, melted butter, and vanilla extract.
06 -
Pour wet ingredients into dry ingredients and gently whisk until just combined. Do not overmix.
07 -
Preheat oven to 190°C (375°F). Grease a 9×13 inch baking dish with butter.
08 -
Pour half of the pancake batter into the dish, spreading evenly. Spoon the blueberry filling evenly over the batter. Top with the remaining pancake batter, spreading as evenly as possible.
09 -
Bake for 30-35 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
10 -
While the casserole is baking or cooling, whisk together powdered sugar, buttermilk, and vanilla extract until smooth. Adjust consistency by adding more buttermilk, 1 tablespoon at a time, if needed.
11 -
Let the casserole cool slightly before slicing. Drizzle with glaze. Serve warm with maple syrup, whipped cream, and fresh mint leaves, if desired.