Heat oven to 375 degrees F. Coat an 8"x 8" baking dish (or 2 quart casserole dish) with cooking spray.
In a large bowl, combine the blueberries, oats, quinoa flakes, pecan or walnuts, brown sugar, cinnamon and salt. Transfer to prepared baking dish and spread out evenly.
In the same large bowl, beat the egg until frothy. Whisk in the milk and vanilla. Carefully pour over the oat mixture. Scatter the butter pieces on top.
Bake 40 to 45 minutes or until center is set and top is lightly browned. Cool slightly and enjoy.