Mix all spices together in a little glass jar. You can double the recipe if you want to, just keep it sealed so it stays fresh!
Make the tacos: Place the chicken breasts in a heavy bottomed sauce pan and cover with water, or chicken broth if you prefer.
Bring to a boil, then reduce heat to a simmer. Simmer until cooked through…about 20 minutes. Check the temperature in the middle of the breasts, it should reach 170 degrees.
Let the chicken cool, then drain most of the liquid out of the pan. Shred the chicken and place back in the pan. Add the tomato paste or ketchup, (if I don’t have tomato paste, I just use ketchup, it works in a pinch!). Add your seasoning…I start with about 1 ½ tablespoons and go from there, adding more as needed.
Heat through, and add more water if the chicken seems too dry. Once it’s heated through and seasoned to your liking, spoon into shells and add your toppings.