Heat olive oil in a large skillet over medium heat.
Add sliced onions and bell peppers to the skillet.
Sauté vegetables for about 5 minutes until softened.
Season the vegetables with salt, pepper, and fajita seasoning.
Push the vegetables to one side of the skillet.
Add shrimp to the other side of the skillet.
Cook shrimp for 2-3 minutes on each side until pink and opaque.
Combine shrimp and vegetables in the skillet.
Warm tortillas in a separate pan or microwave.
Serve shrimp mixture in tortillas and garnish with cilantro and lime wedges.