In a small saucepan add chili powder, oregano, cinnamon, allspice, and red pepper. Warm spices over medium heat until they bloom (smell really good!). (About 2 minutes) Transfer to a medium bowl and mix in potato starch flour and salt.
In a small bowl add lime juice. Dip fillets in lime juice and then dip in flour mixture.
Heat oil in pan and fry fillets for 2-3 minutes each side. Remove from pan and place in bowl for serving. Serve warm with any toppings you like and soft corn tacos.
Take whatever jar of salsa you like, mix it with equal parts of sour cream and serve.