Heat oven 350°F. Spray a 9 x 13" pan with cooking spray and set aside.
Whisk oil and sugar. Add eggs and vanilla; mix. Whisk in melted chocolate then add the remaining ingredients and stir until combined.
Bake 24 minutes.
Brownies for a crowd: Double recipe and bake in a 18x13 sheet-pan for 24 minutes. Oil Substitute: use melted butter, margarine, lard or shortening.Servings: Makes 24 mini bars or 12 regular slices.Freeze: for up-to 3 months.