Chop the mushrooms and onions into large chunks. In a food processor, combine the mushrooms, onions, and garlic cloves. Blitz until the mixture is of fine grain.
Add in Chili powder, Garam Masala, and salt. Blitz until combined.
Remove the lid and let the water cook out. Use a spoon or other apparatus to remove liquid when possible. Stir occasionally until most of the water has been removed.
For square wonton wrappers, cut into circle. Place 1-2 Tablespoons of the mushroom mixture into the center. Fold the wanton in half, enclosing the filling in a semi-circle. Crimp the open edges.
Bring a pot of water to a boil. In batches, add dumplings to the water and let cook until floating (about 3-5 minutes). Remove from pot and pat off extra water.
Notes
Cooking can also be done through a steamer. I did not have one available to me so I went forward with the boiling method.