Whip room temperature butter, add allulose and whip together. Beat room temperature eggs and add in three parts, whipping on high speed each time.
Sift rice flour and baking powder, then mix. Add salt and baking powder and mix again.
Boil pumpkin sweet potatoes, cut into cubes and cool, then add.
Pour into a buttered mold and decorate the top with remaining sweet potatoes.
Bake in a preheated oven at 170°C for 35 minutes.