Prepare the Pan
Melt butter in a 9-inch round cake pan.
Arrange banana slices evenly on the bottom and sprinkle sugar over them.
Make the Batter
Whisk egg, milk, salt, and vanilla extract in a large bowl.
Combine Dry Ingredients
Mix flour and baking powder in a separate bowl.
Mix Wet and Dry
Gradually add dry ingredients to wet ingredients, stirring gently.
Add vegetable oil and mix until smooth.
Assemble the Cake
Pour batter over banana layer and spread evenly.
Bake
Bake at 350°F (175°C) for 30–35 minutes, or until a toothpick comes out clean.
Cool and Invert
Let cake cool 10 minutes in the pan.
Carefully invert onto a serving plate.
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