Roti cake - Matcha nutella bread cake

INGREDIENTS
▢315 gr bread flour ▢5 gr instant yeast ▢40 gr sugar ▢¼ tsp salt ▢165 gr whole milk ▢50 gr egg ▢20 gr unsalted butter softened

If using sourdough starter:
Prepare stiff levain:
▢30 gr active starter (100% hydration) ▢90 gr bread flour ▢40 gr water ▢15 gr sugar

For the dough:
▢210 gr bread flour ▢40 gr sugar ▢¼ tsp salt ▢113 gr whole milk ▢50 gr egg ▢20 gr unsalted butter softened

For matcha sponge cake:
▢300 gr eggs (room temperature) about 6 large eggs ▢120 gr sugar ▢120 gr cake flour ▢¼ tsp salt ▢12 gr matcha powder ▢54 gr oil ▢84 gr whole milk (room temperature)

Filling: ▢Nutella spread