In a large bowl, add masa harina, baking powder, and salt. Mix to combine, then add mixture from blender. Pour 1/2 cup hot water into blender and process to clean the sides of blender. Pour into bowl with the rest of the ingredients. Work the masa, first with a wooden spoon, then with your hands – squishing the masa between your fingers until there is no dry masa and it is all smooth. Place in Ziploc bag and refrigerate overnight or up to 3 days.