Melt the butter and set aside. The butter shouldn’t get brown.
Mix flour, ground cinnamon (optional) and baking powder and set aside.
Clean, peel and trim the apples. Cut them into slices and then into small pieces.
Fill the muffin tin with the paper moulds.Preheat the oven to 160° C fan. Mix sugar, vanilla sugar, salt and eggs with the electric handheld mixer (beaters) until foamy. Add melted butter … Add the flour … Add the cream … and mix.
Fold in the apple pieces.
Fill the batter in the paper moulds.
Put the muffin tin in the oven for about 25 min. Make the famous test with the wooden pin … If you think it’s not ready add another 5 min.
After about 10 min you may free the muffins of the muffin tin. Let the muffins cool down to room temperature on a cooling rack.