When making any crumble topping, it’s important not to warm up the mixture with your hands or a blender. This will melt the vegan butter which will activate the gluten in the flour and make everything incredibly tough. Instead, chop the ingredients together with two knives or with a dough blade, if you have one.
Once cooked, your apples will shrink quite dramatically. If you like your apple crumble quite chunky, chop the apples on the large side. If you want more of a stewed apple compote in your sundae, go for a smaller dice.
To make the sundae extra special, you can warm up the apples in the microwave for a few seconds before adding to the mix!