Preheat grill to medium-high heat.
Coat chicken with olive oil, salt, and pepper.
Grill chicken for 6-8 minutes per side or until it reaches 165°F (use meat thermometer to check).
Let chicken rest for a few minutes, then slice it up.
In a blender or food processor, combine mayo, sour cream, jalapeno, cilantro, kosher salt, pepper, garlic powder, onion powder, and lime juice. Blend until smooth and creamy.
In a big salad bowl, mix romaine lettuce, cherry tomatoes, red onion, cucumber, and avocado.
Top salad with grilled chicken, feta cheese, and candied pecans.
Drizzle the Jalapeno Lime Ranch dressing on top of the salad.
Toss everything together and enjoy your Grilled Chicken Salad with homemade dressing!