In large bowl, place pumpkin, granulated sugar, 3/4 cup brown sugar, the oil, vanilla and eggs; mix well. In medium bowl, mix 2 cups rice flour blend, the baking powder, cinnamon, ginger, baking soda and salt. Stir flour mixture into pumpkin mixture until blended; pour into pan. Sprinkle pepitas over top; press lightly into batter. Spoon streusel mixture over pepitas in pan.