In the bowl of a stand mixer fitted with the paddle attachment, beat the butter on low until it’s pale and light, about 3 minutes. Add the sugar and continue to beat until fully combined. Scrape down the sides, and then mix in the eggs one at a time. Next add in the bananas, yogurt, and vanilla. Fold in the flour, and then strawberries, mixing just until combined. If you’d like, reserve a few berries for the top of the bread.