Add eggs and sugar, mix on high speed until foamy.

Add mashed bananas into the egg foam and mix on high speed for 1 minute.

Add flour, baking powder and salt. Mix on low speed until incorporated.

Add melted butter in the mixture and mix with a spatula until even.

Coat a baking pan with oil and pour the batter into it.

Sprinkle raisins on top of the batter and bake at 350 degrees F for about 35 minutes.