Sooooo not paleo, sugar free, Whole30, gluten free or anything of the sort.
This is my go to recipe for any fruit crumbles. Of course, it’s taken from Nigella (via this page).
1tsp baking powder
110g butter, cold & diced
2tbsp white sugar
2tbsp brown sugar
2tbsp raw sugar
Put the flour and baking powder into a food processor. Drop in the cold, diced butter and blast a few times till crumbs form like rough oatmeal. Chuck in the sugar and blast once to mix through.
I tend to leave the mix in a freezer until ready to go in the oven – bake at 190C.