Begin by boiling salted water in a large pot. Once boiling, add 1 lb elbow macaroni and cook according to package instructions until al dente. Drain and rinse the macaroni under cold water to stop the cooking process and cool down the pasta.
While the pasta is cooking, prepare the corn. Grill 2 ears of corn until they are browned and caramelized (approximately 10-15 minutes on medium heat) or roast in an oven set at 425°F for 12-15 minutes. After cooking, allow the corn to cool, then carefully cut the kernels off the cobs.
In a small bowl or blender, combine the dressing ingredients: 3/4 cup Greek yogurt, 1/3 cup sour cream, juice from 1 lime (about 3 tablespoons), 1 tsp chili powder, 1 tsp cumin, 1 clove of minced garlic, and 1/2 tsp kosher salt. Whisk together until smooth or blend until fully combined.
In a large mixing bowl, combine the cooled macaroni, grilled corn, 1 cup black beans, 1 cup cherry tomatoes (quartered), 1 green bell pepper (diced), 1/2 medium red onion (finely chopped), 1/4 cup fresh cilantro (finely chopped), and 1 jalapeño (seeded and finely diced).
Pour the dressing over the combination of ingredients and toss gently until everything is thoroughly coated. Serve immediately or chill in the refrigerator for about 30 minutes for the best flavor.
Before serving, taste and adjust seasoning with extra salt or lime juice as needed. Garnish with more cilantro and sliced jalapeños for a pop of color and flavor.