Dissolve yeast in 2 tablespoons of lukewarm water and let it sit for 10 minutes or until the mixture becomes frothy.
Add sugar, salt and baking soda to the flour and mix well.
Add the oil and yogurt mix it well, this will become crumbly dough.
Add the water/yeast mixture and add water as needed to make the dough firm. Note: After dough rises, it will become a little softer.
Knead until the dough is smooth. Cover the dough with damp cloth and keep it in a warm place for 3-4 hours. The dough should almost double in volume.
Boil 2 medium potatoes until they are tender.
Once cooked, drain the water and let the potatoes cool down. Note: Do not cool the potatoes under running water. Potatoes will absorb the water and become soft.
Next peel the skin off and mash the potatoes.
Add green pepper, cilantro, cumin seeds, mango powder, garam masala, and salt to the mashed potatoes and mix it well.