Preheat oven to 350 degrees.
In a medium size bowl, combine the flour, cocoa powder, baking powder and salt. Set aside.
In a separate bowl, combine your wet ingredients – 2 tbs. oil, ⅓ C. butter or margarine and your eggs.
Slowly fold in your dry ingredients in with the wet ingredients and mix well.
Pour the batter into the greased 8×8 baking dish and bake for 25-30 minutes. Around 25 minutes insert a toothpick into the brownies and if it comes out clean, they are done. Let the brownies cool a few hours prior to layering your s’mores jars.