Mix the first 4 ingredients with the mixer until foamy. Then mix the flour with the baking powder and stir in as well.
Place the dough on a buttered or parchment-lined baking sheet and bake in the preheated oven at 200 ° C top / bottom heat for 15 minutes on the middle rack.
Meanwhile, heat the rest of the butter with the sugar and cream in a saucepan. Once the sugar has dissolved, stir in the sliced almonds and bring everything to a boil.
Spread the mixture on the cake and bake for another 15 minutes.