Preheat oven to 350 degrees F and grease a 9-inch cake pan.

In medium bowl, combine flour, baking soda, baking powder and salt until fully incorporated.

In large bowl, use a hand mixer on high to combine sugar, olive oil and applesauce. Add mashed banana and continue mixing.

Using a spoon instead of a hand mixer, gently mix in lemon juice, lemon zest and vanilla extract until just combined.

Slowly add flour mixture into wet mixture and stir with spoon until just combined. Don’t overmix.

Scoop batter into prepared cake pan and tap on your counter to remove air pockets.

Bake 35 minutes or until golden and a toothpick inserted in the center comes out clean.

Allow to cool completely in the pan before gently removing.

When plating, dust generously with powdered sugar. Decorate with thin slices of lemon and a sprig of rosemary.