Step 1

Preheat the oven to 375 degrees F. Spray a 9-by-5-inch loaf pan with cooking spray.

Step 2

Whisk together the flour, baking powder, baking soda and salt in a bowl; set aside.

Step 3

Thoroughly mash the avocado with the lemon juice in a large bowl. Add the sugar, half-and-half, vanilla and egg and whisk until thoroughly combined. Add the flour mixture and stir until incorporated.

Step 4

Pour the batter into the prepared loaf pan and bake until golden brown on top and a toothpick inserted in the center comes out clean, 45 to 55 minutes. Let cool in the pan for 10 minutes, then remove to a wire rack to cool completely.