Step 1

Heat the oil in a cast iron skillet on medium-low heat. Add the onions, peppers, a salt and pepper. Toss well to coat and cover.

Step 2

Cook, stirring occasionally until onions are caramelized, about 15 to 20 minutes.

Step 3

Meanwhile, season the shrimp with chipotle chile powder, salt and pepper.

Step 4

While the onions are cooking, heat a large skillet on high heat. Add oil.

Step 5

When the oil is hot add the shrimp and cook for about 2 minutes on each side until cooked through. Remove from heat.

Step 6

Add juice from the lime and cilantro. Toss well.

Step 7

Combine with the cooked onions and peppers and serve with tortillas.