Prepare 8x8 baking pan with baking spray or by buttering and then flouring it. Set aside.
Preheat oven to 350.
Beat softened butter and sugar until smooth. Add egg replacer mixture and vanilla and beat on low 1 minute more.
Add flour, baking powder, baking soda and salt and stir together. Fold in the chips and/or M&M's.
Spread mixture into prepared pan and bake approximately 25 minutes, until center is set. Allow to cool and then cut into squares.