Preheat your oven to 350°F (175°C). Grease the loaf pan with butter or cooking spray and set aside.
In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition. Then, stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking soda, baking powder, salt, and ground cinnamon.
Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk. Start and end with the flour mixture. Mix until just combined.
Fold in the chopped pecans using a rubber spatula. Ensure they are evenly distributed throughout the batter.
Pour the batter into the prepared loaf pan and smooth the top with the spatula.
Bake in the preheated oven for 60 minutes, or until a toothpick inserted into the center of the bread comes out clean.
Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.