Combine the flour, baking powder, baking soda, salt, and cinnamon in a medium bowl and set aside.

In a separate bowl, beat the eggs, sugar, butter, applesauce, and vanilla together

Stir in the grated yellow summer squash

Add the dry ingredients to the squash mixture and stir until moistened.

Pour into a loaf pan sprayed with cooking spray

Bake at 350 degrees for 45 minutes or until a knife inserted in the center comes out clean.

Cool slightly before removing from pan then sprinkle with powdered sugar

Slice and serve warm with butter