Preheat oven to 350°F (175°C). Grease and flour a loaf pan.
In a large bowl, cream together butter and sugar until light and fluffy.
Beat in eggs, one at a time, then stir in vanilla and mashed bananas.
Combine flour, baking powder, baking soda, and salt. Gradually add to the banana mixture, alternating with milk.
Pour batter into prepared pan. Bake for about 60 minutes or until a toothpick inserted into the center comes out clean.
Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Notes
Ensure bananas are very ripe for the best flavor.
• Sift flour for a lighter cake texture.
• Cream butter and sugar well for fluffiness.
• Don't overmix the batter to avoid a dense cake.
• Let the cake cool completely before slicing.