Preheat oven to 375° and line a 9x9" baking dish with parchment paper.
Add the dry ingredients and oil or vegan butter to a food processor and pulse until combined. Take a palm full of the dough and squeeze it to see if it sticks together. If it doesn't, pulse longer.
Pour most of the flour blend onto the bottom of the baking sheet, reserving about 1 cup for the topping, and press evenly with damp hands.
Cover the crust evenly with the fruit. Sprinkle a bit more coconut sugar over the fruit, and drizzle the lemon juice over it.
Spread the remaining crumble on top, and bake for 30 minutes.
Let it cool for at least 10 minutes before serving.