Preheat oven to 375 and line a 9x9 dish with parchment paper
If using frozen berries allow to thaw slightly
Melt & cool butter
Whisk flour, baking powder, and salt together
Add butter, syrup , and vanilla and use a fork to combine dough until crumbled
Press 2/3 of that dough into the dish and use a silicone spatula to press down evenly. Poke a few holes in the crust, then bake for 10 min
Meanwhile, add filling ingredients to a bowl and use a fork to slightly smash the mixture together
Pour overtop crust, and sprinkle remaining crumble overtop
Bake for an additional 35 min
Allow to cool for 30min, then transfer to the fridge for at least 2 hours for smoother slicing
Enjoy!
Store in the fridge