Step 1: In a small bowl, whisk together the chili powder, smoked paprika, cumin, garlic powder, onion powder, salt, and black pepper to create the seasoning for your shrimp fajita recipe.
Step 2: Pat the shrimp dry with paper towels. Place them in a medium bowl and toss with 1 tablespoon of olive oil and half of the prepared spice mix.
Step 3: Heat the remaining 1 tablespoon of olive oil in a large cast-iron skillet over medium-high heat. Add the sliced onions and bell peppers.
Step 4: Sauté the vegetables for 5-6 minutes until they are tender and have developed some charred edges. Remove the vegetables from the skillet and set aside on a plate.
Step 5: Add the seasoned shrimp to the same hot skillet in a single layer. Cook for 2 minutes on the first side, then flip and cook for another 1-2 minutes until opaque.
Step 6: Return the vegetables to the skillet and drizzle with fresh lime juice. Toss everything together for 30 seconds to combine and warm through. Serve immediately with warm tortillas.