Shrimp and Bell Pepper Fajitas

Place a large skillet over medium-high heat and add 2 Tbs. olive oil. Once the oil is hot, add the sliced onion, 1/2 tsp. salt, cumin, and chili powder; saute until translucent and starting to brown, about 5 minutes. Add the peppers and another 1/2 tsp. salt; saute 5 to 8 more minutes or until peppers are soft. Transfer peppers and onions to a large bowl.

Return the skillet to heat and add remaining 2 Tbs. olive oil. Add the shrimp, toss to coat, and sprinkle with remaining 1/2 tsp. salt. Cover, stirring halfway through, until shrimp are cooked through, 6 to 8 minutes. Add lime juice and stir, then stir in peppers and onions to warm through. Serve with warm tortillas, avocado slices, and sour cream.