Remove the core and cut the apples into pieces with the skin on. Meanwhile, heat the butter, agave, and ginger in a pan, let it foam a bit and stir in the cinnamon, then place the apple pieces on top.
Put all the ingredients for the crumble in a bowl and knead together until you have a crumbly texture and cover the apples with it.
Bake for 35 to 40 minutes in a preheated oven at 200°C, cover with foil if it colors too quickly, let cool slightly and serve.
Tips
Vary with the nuts Make the dish lactose -free by replacing butter with coconut oil for a gluten -free version: Replace the flour with gluten -free flower and use gluten -free oatmeal