Preheat the oven to 350 degrees and prepare a 9-inch square baking dish or equivalent with either spray oil or line with parchment paper to keep 100% oil-free.
Mix the dry ingredients in a small bowl and set aside then mix the wet ones in a medium mixing bowl and set aside.
Now mix the topping ingredients in a bowl and you will use this last.
Mix the dry ingredients into the wet and spread evenly in the bottom of the pan. Sprinkle the blueberries over the top and press in slightly.
<g class="gr_ gr_52 gr-alert gr_spell gr_disable_anim_appear ContextualSpelling ins-del multiReplace" id="52" data-gr-id="52">Cruble</g> the topping over the top. Bake for 30 to 40 minutes until a fork comes out clean when you test the middle of the cake.
