Tomorrow's Baked Good: Brownies

From The Settlement Cookbook

“The famous all-purpose cook book for beginner and expert” 1965 edition

Brownies

2 squares unsweetened chocolate

2 tablespoons butter

2 eggs

1 cup sugar

1 teaspoon baking powder

1 cup flour

1 teaspoon vanilla

1/4 teaspoon salt

Instruction from The Settlement Cookbook:

Bar cookies are baked in a single sheet, and cut up after baking. Brownies and similar cake-like cookies are baked in this manner, as are some rich cookies of the shortbread type.

I am skeptical of this advice:

Brownies and other moist cookies should be stored in an airtight container. A piece of apple or potato may be placed in the container to keep the cookies moist and chewy