Preheat oven to 325 f/165 celcius. spray an 8x4-inch loaf pan with baking spray and line with a piece of parchment paper. in a large bowl with an electric mixer cream the butter with the sugar. add the eggs one at a time and beat in well after each addition. beat in the lemon zest, lemon juice, and vanilla. then add the greek yoghurt. in a separate bowl, whisk together the flour, salt, baking soda, and baking powder. with mixer on low, add the flour mixture to the butter mixture. scrape into prepared loaf pan and level batter. bake for 55-60 minutes, or until a tester inserted in the center comes out clean. allow to cool in the pan for 15 minutes, then remove from pan. allow to cool on a cooling rack. while loaf is still a little warm, prepare the glaze by stirring together all the glaze ingredients in a small bowl. wait for the cake to cool, and enjoy!