Preheat oven to 350°F and line an 8x8 pan with parchment paper. In a bowl, mix all crust/crumble ingredients until well combined.
Press ⅔ of the dough into the prepared pan, saving the rest for crumbling on top. Bake for 10 min.
In a medium saucepan, add your blueberries and cook over medium-low heat until you can begin to mash them.
Add the rest of the filling ingredients and continue cooking until you have a thick jam filling.
Spread the filling over the baked crust, add the rest of the crust dough crumbled over top, and return to oven to bake for another 18-20 min. Let cool completely before slicing and enjoying!