Heat oven to 375°F. Line a loaf pan with one big piece of parchment paper pressed into the corners and up the sides.
Melt butter in a large bowl, then whisk in granulated sugar and zest.
Add yogurt and eggs and whisk to evenly combine.
Sprinkle surface of batter with baking powder, baking soda, and salt and whisk thoroughly into the batter.
Add flour and berries and use a flexible spatula or spoon to mix them in so that no pockets of flour remain.
Spoon into prepared loaf pan and drop it on the counter a few times to make sure there are no air pockets.
Smooth the top and sprinkle it with turbinado sugar.
Bake for 60 to 70 minutes, or until a skewer inserted into a few places in the loaf comes out batter-free.
Remove from oven and let cool in pan. Use parchment paper to lift it out of the pan and cut into thick slices.
