Preheat oven to 350°F. Grease, or spray with non-stick cooking spray, an 8x8 baking pan.
Melt butter or margarine in microwave. Combine melted butter or margarine, vegetable oil, and brownie mix. Mix until uniform with a wooden spoon or spatula. Add eggs*. Mix well.
Spread in prepared baking pan.
Bake for 20-24 minutes or until an inserted toothpick comes out clean. Allow to fully cool before cutting.
*for chewier brownie, add 2 Tbsp. of water with the eggs.
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