Preheat oven to 350℉. Line an 8x4 inch loaf pan with parchment paper.
In a large bowl, whisk together the eggs, olive oil and buttermilk until smooth. Next, sift in the flour, baking powder, salt and mix to combine. Fold in the scallions, dill, mozzarella and feta. Transfer mixture to the pan and spread out evenly. Bake for 50 minutes to 1 hour or until a toothpick comes out clean. Allow to set in your pan for 15 minutes then transfer to a wire rack to cool completely.