Stir together the flour, sugar, baking powder, baking soda, and salt.
Add the butter to the flour mixture. Use a fork, 2 knives, or your fingers to cut it into the dry ingredients. Keep doing this until there are no pieces bigger than a small pea.
In a medium bowl, beat together the milk, zest and egg.
Pour the wet ingredients into the dry ingredients. Mix until moist and there aren't big ribbons of flour. Don't mix until everything is smooth.
Gently fold in the pecans.
Pour the batter into the loaf pan. Bake for about an hour.
Let cool, then serve.
Recipe by Cooking is Messy at https://www.cookingismessy.com/2015/02/20/brown-sugar-carrot-bread/