Preheat the oven to 350°F(177°C). Grease 8 ½ * 4 ½ inch (21,5*10,5cm) loaf pan and line the bottom and sides with parchment paper, about 2 inches(5 cm) of overhang on each side.
Place 210 grams (1 and ½ cup) of flour, baking powder, baking soda and salt into a medium bowl and stir with a whisk. Set aside.
Put the sugar and eggs into a large bowl and stir with a whisk until just combined.
Mix in the melted butter, buttermilk and vanilla extract.
Add the flour mixture over the dry ingredients in 2 batches. You can start to stir with a whisk and continue with a spatula.
Stir 135 grams (¾ cup) of chocolate chips with 10 grams (1 tablespoon) of flour in a bowl with a spoon to avoid chocolate chips sinking to the bottom of the cake once baked. Fold the chocolate chips into the batter with a spatula.
Pour the batter into the loaf pan. Add the extra chocolate chips evenly on top.
Bake for almost 48-52 minutes or until a toothpick that is inserted into the center comes out clean. You can check the oven after 40 minutes as baking time may change from oven to oven. Don't overbake so the cake will be moist.
After you remove the pan from the oven, let the cake stay in the pan for 10 minutes and then let the cake cool for at least 50 minutes on a wire rack. You can enjoy it while it is still warm.