Preheat your oven to 350°F / 175°C.
Cut the corn tortillas into 1/2-inch strips and spread them onto a large baking pan. Lightly coat the strips with nonstick cooking spray.
Bake for 15 to 18 minutes, stirring once halfway through, until they are golden and perfectly crisp.
Transfer to a wire rack to cool completely.
While the tortillas bake, prepare the dressing.
In a small bowl, whisk together the light sour cream, 1/4 cup (960 ml) cilantro, milk, olive oil, minced garlic, chili powder, lime peel, salt, and pepper until smooth and creamy.
Set aside.
Assemble the salad.
In a large serving bowl, create a bed of torn romaine lettuce. Artfully arrange the chopped tomatoes, rinsed black beans, corn kernels, shredded cheese, and chopped avocado over the lettuce.
Drizzle generously with the cilantro-lime dressing, sprinkle with the cooled tortilla strips, and garnish with extra cilantro if desired.
Serve immediately and enjoy!
Roast Your Corn: For a deeper, smoky flavor, toss the corn kernels on the baking sheet with the tortilla strips and roast them together until tender and lightly charred.