Mix all the dry ingredients (flour, sugar, cocoa powder, sea salt, and baking powder) together
Store in an airtight container in a dark cool location (pantry)
In a large bowl, mix 2 ¼ cup brownie mix with ½ cup melted butter, 2 eggs and 1 tsp of vanilla extract
Mix until the batter is smooth
Preheat the oven to 350° F and grease an 8x8 (9x9 works too) pan
Pour batter into prepared pan and bake for 20-24 minutes or until toothpick comes out clean
Optional: add chopped nuts, various flavors of chips, peanut butter or other desired mix-ins
