Gluten Free and Egg Free Brownies

From : http://www.egglesscooking.com/2013/12/10/gluten-free-and-egg-free-whole-grain-banana-brownies-recipe/

Prep time: 20 Mins Cook time: 26 Mins Yields: 16 Brownies
Use any gluten-free flour you have in your pantry to make these decadent and delicious brownies at home.

INGREDIENTS:
1/2 cup coconut palm sugar
3 tablespoons avocado oil
1/4 cup plain yogurt
1 banana, mashed
6 tablespoons unsweetened cocoa powder
1 teaspoon vanilla extract
1/2 cup amaranth flour
3/4 teaspoon baking powder
1/4 teaspoon baking soda
1/8 teaspoon salt
3 tablespoons mini chocolate chips
1/4 cup chopped walnuts
2 tablespoons water (optional)

SUBSTITUTES:
coconut palm sugar – white or brown sugar
avocado oil – any other oil of your choice
yogurt – unsweetened applesauce or flax seed meal
amaranth flour – any other flour of your choice

PROCEDURE:
Preheat the oven to 350F/180C for 15 minutes. Line a 9-inch square pan with aluminum foil with the foil hanging on two sides of the pan (so that you can lift the brownie easily off the pan once it is baked) and grease it lightly with non-stick cooking spray.
In a large bowl, beat sugar, oil and yogurt using an electric mixer for about 2 minutes.
Add the mashed banana, vanilla extract and cocoa powder and beat on low speed.
In a small bowl, stir together the flour, baking powder, baking soda and salt. Add to the cocoa mixture and stir it well with a spatula to mix well. If you feel the batter is too thick add water one tablespoon at a time until the desired consistency is reached.
Stir in chocolate chips and chopped walnuts. Spread the batter evenly in prepared pan.
Bake in the oven until just set, 23-26 minutes. Leave the pan on a cooling rack for about 5 minutes. Now that we have left the aluminum foil hanging, you should be able to lift it off without any trouble. Cool it for another 20-30 minutes before you can cut it into slices.

NOTES:
As always make sure that all the ingredients you use is gluten-free if you are baking it for somebody who is severely allergic. Be it the baking powder, flour or chocolate chips.
This is a very chocolaty brownie. So you may want to cut back the cocoa powder to 5 tablespoons maybe if you want it less chocolaty.
Amaranth flour is available in Indian stores as Rajgaro/rajgira flour.
I used Greek yogurt which is thicker than regular yogurt. So I had to use 2 tablespoons of water to the batter at the end to make it less thicker. This may not be required if you use regular yogurt.
These brownies can very well be veganized by using flax seed meal or unsweetened applesauce as an egg substitute instead of yogurt. In that case I would be blending a tablespoon of flax seed meal with 3 tablespoons of lukewarm water until its thick and foamy.
This recipe can be doubled. Use a 13×9 inch pan and bake it for 25-30 minutes. You can get 24-36 brownies approximately.