Heat the Blackstone to medium heat so it warms evenly. Add a small amount of oil, then add the poblano, onion, tomatoes, and serranos. Sauté until softened and juicy, with a lightly roasted aroma.
In a bowl, season the shrimp with garlic powder, Chef Merito Fish Seasoning, paprika, salt, pepper, Knorr, and minced garlic. Toss until evenly coated.
Increase heat to medium through medium high and add the shrimp directly to the vegetables. Cook, stirring frequently, until the shrimp are pink, firm, and well combined with the veggies.
Lower one section of the griddle to low heat. Warm the tortillas, then sprinkle cheese onto each tortilla and let it melt. Add a strip of the shrimp and vegetable mixture over the cheese.
Fold the tortillas gently to form tacos, spoon in your favorite salsa, and serve immediately while hot and melty.