Make the dressing: In a large mixing bowl, whisk together the sour cream, mayonnaise, lime juice, smoked paprika, cumin, kosher salt, black pepper, chives, and cilantro until creamy and well combined.
Char the corn: Heat avocado oil in a large skillet over medium-high heat. Add the corn and cook for 4–5 minutes, stirring occasionally, until lightly charred and smoky. Remove from the heat and let cool slightly.
Toss everything together: Add the warm corn, queso fresco, red onion, and jalapeño to the bowl with the dressing and toss until evenly coated.
Finish and serve: Taste and adjust lime juice or salt if needed. Top with extra cheese, cilantro, and a sprinkle of smoked paprika before serving if desired.