Steel Cut Oat Blueberry Pancake

1. Soak 2/3 cup steel cut oats in 2 cups buttermilk overnight.
2. In the morning, preheat your oven to 350°F (175°C).
3. To the oat mixture, mix in 1 egg, 1 egg white, 2 tablespoons brown sugar, 1/3 cup all purpose flour, 1/3 cup whole wheat flour, 1 teaspoon baking soda, and 1/2 teaspoon salt.
4. Gently fold in a handful (about 1/2 cup) of blueberries.
5. Pour the batter into an oven-safe baking dish or cast iron skillet.
6. Bake at 350°F (175°C) for 30-40 minutes, or until golden brown and cooked through.
7. Let cool for 10 minutes before flipping and slicing.