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Preheat oven to 400 F degrees. Grease 9x13 inch glass baking pan.
In a large bowl, cream butter and brown sugar together until smooth.
In a separate bowl combine flour, oats, salt, and baking powder. Add to the creamed mixture.
Press half of the mixture into the bottom of the prepared baking pan. Spread the jam over the bottom crust. Sprinkle remaining mixture over the jam layer.
Bake at 400 F degrees for 20-25 minutes or until lightly browned. Allow to cool before cutting into squares. Enjoy!
Source: My mother.