To make muffins: In a bowl, toss the self-raising flour, sugar, matcha powder and mix well. In another bowl beat the egg, add buttermilk and the melted butter together. Mix well. Add the flour and strawberry and the red bean into wet mix and stir until just combined. Do not over mix. Fill the muffin cups and put the Kinako crumb on each until just covered. Bake for 25min.