In a large skillet over medium heat, add the ground beef or turkey, onion, and a pinch of salt and pepper. Cook, stirring often and breaking the meat into small pieces, until the meat is cooked through, 5-7 minutes.
Drain off any excess grease and return the skillet to the stove top.
Add the 1/2 cup tomato sauce and taco seasoning. Stir together until the meat is coated in the sauce.
Simmer for about 5 minutes then remove from the heat.
Meanwhile, cook up the corn tortillas. Pour 1/2 cup oil in a medium skillet, heat over medium high heat for about 2 minutes. (If the tortilla sizzles when it hits the oil, it’s hot enough!)
Gently lay the tortilla in the oil and fry each side for about 30 seconds, until slightly browned and lightly crisped.
Remove the tortilla to a paper towel to absorb oil, and using tongs, carefully fold the tortilla over to create a taco shape.
Fill the tortillas with the taco meat. Add desired toppings and enjoy!