Preheat oven to 375 F. Line an 8-inch round pan with parchment paper.
In a large bowl, combine sugar, flour, ginger, baking powder & salt.
Cut in cold butter with a pastry cutter until the dough resembles coarse crumbs. Set aside.
Whisk together eggs, sour cream & vanilla. Mix the wet ingredients with the dry ingredients, mixing until just combined.
Spoon half of the dough into prepared baking pan. With a fork slightly pat evenly over pan. Top with spoonful’s of red bean paste then distribute it evenly over dough. Place the remaining dough on top of beans & distribute evenly. Sprinkle with black sesame seeds.
Bake for 25 -30 minutes or until golden & tests done with a wooden pick. Remove from oven & cool on a wire rack. Slice in wedges & serve.