Combine and mix all spices in a bowl.
Remove the tail from shrimp and place in a bowl. Season the shrimp with 2 tbs. of seasoning and squeeze one lime and mix well.
Slice the onion, red pepper and yellow pepper. Season with 1 tbs. of seasoning and mix.
Heat a pan on high heat. Once hot, add the shrimp. Stirring occasionally, cook for about 4-5 minutes, until the shrimp is totally pink, and you no longer see any gray parts. 3 minutes until cooking, squeeze one lime over shrimp.
To cook the fajitas, place the seasoned onions and peppers in a pot. Cook over high heat for about 4-5 minutes, until they are soft, but with a slight crunch.
Heat taco shells in the oven as directed by the brand.
Once done, begin to layer your tacos with all the toppings you can dream of. Enjoy!