Turn the oven down to 350 degrees. Line a 9 X 9 baking dish with parchment paper. In a bowl, mix together the oats, flours, remaining brown sugar, salt, and baking soda. In another bowl, whisk together the egg, yogurt, melted butter, and honey. Combine the wet and dry ingredients to form a dough.
Pour the roasted blueberries and any juice on top. Top with the remaining dough by dropping little balls of dough, scattering them to cover most of the top. It’s fine if blueberries poke through in some spots.