4:
Instructions:
1. Preheat oven to 350°F. Grease and flour a loaf pan.
2. In a bowl, whisk flour, baking powder, and salt.
3. In a separate bowl, cream butter and sugar until fluffy.
4. Beat in eggs, one at a time. Add lemon zest and vanilla.
5. Gradually add dry ingredients and mix until blended.
6. Pour batter into prepared pan, smoothing the top.