Step-by-Step Method:

1. Preheat Oven:
   Set your oven to 350°F (175°C) to get it ready while you prepare the ingredients.

2. Prepare the Loaf Pan:
   Grease and flour a standard 9×5 inch loaf pan to prevent sticking and ensure an even bake.

3. Mix Dry Ingredients:
   In a large bowl, whisk together:

   • All-purpose flour

   • Brown sugar

   • Baking soda

   • Salt

   • Chopped rhubarb

4. Mix Wet Ingredients:
   In another bowl, combine until smooth:

   • Greek yogurt

   • Vegetable oil

   • Vanilla extract

   • Egg

5. Combine Ingredients:
   Gently stir the wet mixture into the dry ingredients. Do not overmix to avoid a dense texture. Carefully fold in the chopped rhubarb.

6. Create the Cinnamon Swirl:
   In a small bowl, mix:

   • Granulated sugar

   • Ground cinnamon

7. Layer the Batter:

   • Pour half the batter into the loaf pan

   • Sprinkle with half the cinnamon-sugar mixture

   • Add the remaining batter

   • Finish with the remaining cinnamon-sugar topping

8. Add Nuts (Optional):
   Sprinkle chopped pecans or walnuts on top for extra flavor and crunch.

9. Bake:
   Place in the oven and bake for 60–70 minutes. Insert a toothpick in the center—if it comes out clean, the bread is done.

10. Cool:
    Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

11. Serve:
    Slice and enjoy this deliciously layered, cinnamon-spiced rhubarb bread.