Mix together all the crust ingredients in a mixing bowl using your hands until it becomes dough-like. Don't worry that the dough won't stretch or feels a bit crumbly.
Get a small amount of the dough and place into each space in the muffin pan.
Using your hands, spread the dough so that it forms a crust (it'll be a bit thicker of a crust than traditional tarts – just under ¼-inch thick).
Bake in the oven for 15 minutes. Start to make the apple filling while the crust is in the oven.
Leave to cool.
Filling
Melt the coconut oil in a saucepan and add in all the other filling ingredients (apple slices, vanilla extract, spices and optional honey).
Let the apple cook for 20-30 minutes until it's very soft.
Pour the apple filling into a bowl to cool for 10 minutes.
Spoon the apple filling into each tartlet crust so that it's level with the top of the crust. Then take 5-6 individual slices of apple for each tartlet and layer then in a cascade on the top covering the filling. Place the last slice facing the other way (see photo below).