Preheat oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.
In a medium bowl, whisk together flour, baking soda, salt, and cinnamon.
In a large bowl, beat together melted butter and sugar until combined. Add eggs and vanilla, mixing well.
Stir in mashed bananas until smooth.
Gradually add the dry ingredients to the wet mixture, stirring just until combined.
Gently fold in chopped strawberries.
Pour the batter into the prepared loaf pan and spread evenly.
Bake for 55–65 minutes, or until a toothpick inserted into the center comes out clean.
Allow bread to cool in the pan for 10 minutes before transferring to a wire rack to cool completely.