In one large bowl, sieve and stir together whole wheat flour, baking soda, and baking powder.
Add chia seeds and mix. Keep it aside for now.
In another bowl, add oil, and milk.
Add powdered sugar and whisk it together till it's well combined.
Then add the Stonyfield Organic yogurt to the bowl.
Next, add the orange zest, and vanilla extract. Mix it all together.
Make a well in the center of the dry ingredients and pour the wet ingredients into the well.
Gently fold the mixture using a rubber spatula only until the ingredients are combined.
Pour into the loaf pan and sprinkle the top with chia seeds.
Preheat the oven to 350°F. Add a cup of water to a wide baking pan and place it at the bottom of the oven while it's getting pre-heated.
Grease and line a loaf pan with parchment. Bake for 40-45 minutes until a toothpick stuck into the center comes out clean.
Slice and serve the cake warm or cold along with tea or coffee.