Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
In a large mixing bowl, mash the ripe bananas with a fork until smooth.
Add the sourdough discard, plain yogurt, honey or maple syrup, oil, eggs, and vanilla extract to the mashed bananas. Mix well until combined.
In a separate bowl, whisk together the spelt flour, baking powder, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix.
Gently fold in the diced strawberries until evenly distributed throughout the batter.
Pour the batter into the prepared loaf pan, spreading it out evenly.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for 10-15 minutes, then transfer it to a wire rack to cool completely before slicing.