Cinnamon Streusel Coffee Cake

Gluten-free flour blend 52.5% , non-gmo canola oil 23.8% , cane sugar 9.0% , egg 7.4% , buttermilk 3.7% , sour cream 1.8% , cinnamon bits 0.9% , brown cane sugar 0.5% , water 0.2% , vanilla extract 0.1% , salt 0.1% , baking powder 0.0% , E500ii 0.0% , E415 0.0% , natural flavouring 0.0% , streusel topping 0.0% , Gluten-free flour blend 0.0% , cane sugar 0.0% , unsalted butter 0.0% , cinnamon 0.0%