Create the Flavorful Marinade: In a small bowl, combine the ¼ cup olive oil, minced garlic, 1 tablespoon of lime juice from half a lime, Cajun spice, and salt to create a zesty marinade.
Prepare the Veggies: Slice the bell peppers and onions evenly into 1/3-inch thick pieces. Place them in a medium bowl and pour half of the prepared marinade over the vegetables. Toss well to ensure each piece is coated.
Marinate the Shrimp: Pat the shrimp dry with paper towels. Place them in a separate medium bowl and add the remaining marinade. Stir to evenly coat the shrimp, letting those flavors meld.
Serve it Up: Serve the shrimp fajitas with warm or toasted flour tortillas, a drizzle of jalapeño ranch, sliced avocado, and lime wedges on the side for an extra zing.
Notes
Can be prepared ahead by marinating shrimp and prepping veggies.