Buckwheat muffins with apple filling (video)

(for 12 muffins)
150 g buckwheat flour
50 g oat flour
50 g oatmeal
pinch of salt
1 tsp baking powder
3-4 tbsp coconut sugar
2 ripe bananas
2 tbsp flax seeds + 4 tbsp plant milk
2 tbsp peanut butter
1,5 dl canned coconut milk
1 dl plant milk
filling: 2 smaller apples, cinnamon, lemon juice

For the filling: chop apples into little cubes, and saute with cinnamon and lemon juice until tender. Mash bananas with a fork, and mix in all the ingredients for the batter until smooth. Spoon the batter into the muffin tins, but just for the half of the tin. Then add a few apple cubes into the middle of the batter, and cover with the batter. You can top them with apple slices and cinnamon. Bake for 20 minutes on 200°C. Let them cool and remove from the muffin tin.