01 -
Preheat oven to 350°F (175°C). Grease and flour a 9×5-inch loaf pan or line with parchment paper.
02 -
In a medium bowl, whisk together flour, baking soda, baking powder, salt, and cinnamon until well combined.
03 -
In a large bowl, beat together oil, sugar, sour cream, egg, and vanilla until smooth and fully incorporated.
04 -
Gradually stir the dry ingredients into the wet mixture until just combined. Gently fold in the chopped rhubarb.
05 -
Pour batter into the prepared loaf pan. Sprinkle with cinnamon sugar or streusel topping if desired.
06 -
Bake for 50–60 minutes, or until a toothpick inserted in the center comes out clean.
07 -
Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.