Let's make it
In medium bowl, toss shrimp and chili powder; let stand 10 minutes.
In separate medium bowl, toss jalapeño, watermelon, onion, 1 tablespoon oil, lime juice, cilantro and salt. Makes about 1 1/2 cups.
In batches, on griddle or in large skillet, heat tortillas over medium-high heat 4 minutes or until lightly browned, turning once.
In large skillet, heat remaining 2 tablespoons oil over medium-high heat. Add shrimp mixture; cook 5 minutes or until shrimp turn opaque throughout and internal temperature reaches 145°, turning once.
Serve shrimp in tortillas topped with cheese, jalapeño mixture and sour cream.
Approximate nutrition values per serving: 363 Calories, 18g Fat, 5g Saturated Fat, 173mg Cholesterol, 576mg Sodium, 30g Carbohydrates, 4g Fiber, 6g Sugars, 0g Added Sugars, 21g Protein