Preheat the oven to 170°C (338°F).
Melt white chocolate and butter together using a double boiler.
Add sugar and mix well.
Add eggs one at a time, stirring thoroughly each time.
Add cake flour and cheddar powder, mixing evenly.
Add yellow cheese powder and salt to complete the batter.
Pour the batter into a pan lined with parchment paper.
Place cheese cubes on top of the batter.
Bake in the oven at 170°C (338°F) for 25 minutes.
Cool and slice into desired portions.