Preheat your oven to 350°F (175°C) and prepare a 9x5 inch loaf pan by greasing and lining it with parchment paper.

In a medium bowl, whisk together flour, baking soda, baking powder, salt, and cinnamon until well blended.

In a large mixing bowl, blend granulated sugar, brown sugar, and melted butter until smooth. Add eggs one at a time, then stir in Greek yogurt.

Gently fold dry ingredients into the wet mixture until just combined; it's okay to have a few lumps.

Carefully fold in diced strawberries and rhubarb, ensuring fruits remain intact.

Transfer the batter to the prepared loaf pan, smooth the top, and bake for 55-65 minutes or until a toothpick comes out clean.

Let cool in the pan for 15 minutes, then transfer to a wire rack to cool completely.