Hanna's sweet potato moussaka

I've never made moussaka before and I'm pretty sure this is not really the way to make it but I wanted to try and make my own version of it using sweet potato. Not really sure if it can even be called moussaka but that's the only name I could come up with.

Ingredients
serves 3-4
400 g mince meat
1 onion
1 capsicum
1 garlic clove
200 ml passata
cayenne pepper
oregano
paprika powder
salt and pepper

125 ml cream
150 g grated cheese
25 g butter
extra cheese for topping

1 sweet potato, peeled
1 eggplant

Preheat the oven to 200 degrees.
Chop the onion, garlic and capsicum finely. Fry off in some olive oil for a few minutes. Then add the minced meat and let it get brown. Add the passata together with all the spices and let it simmer together for about 5-10 minutes. While it's simmering; add the butter and the cream together in a separate pot. Let it get warm, then add the cheese and let it melt. Cut the sweet potato and eggplants into slices about ½ cm thick.
Grease an ovenproof dish with some butter. Add a layer of the meat sauce, follow with the sliced aubergine, then add one thin layer of the cheese sauce. Put on the rest of the meat sauce, then the sliced sweet potato and last finish it off with the rest of the cheese sauce and top off with some extra cheese. Bake in the oven for 30-40 minutes.